Food preservation is a process by which edible items such as fruits and vegetables are prevented from getting spoil. The nutritive value, flavour and colour of the foods preserved remain intact.
Food preservation is a process by which edible items such as fruits and vegetables are prevented from getting spoil. The nutritive value, flavour and colour of the foods preserved remain intact.
This document describes importance of food preservation.
It clears basic concepts regarding factors responsible for food spoiling and importance of preserving food products
This presentation slides helps all of you to increase knowledge and understanding about different food preservation methods. It will be a great help to make a powerful presentation.
Preparing Vegetable Dishes Prepared by Ms. Leody C. Jumao-as
Learning Objectives:
Identify the market forms of vegetables
Prepares and present vegetable recipes with appropriate sauces and accompaniments
Basic Principles in Cooking Vegetables to Maintain Nutrients
Cook vegetables in the smallest liquid possible .
Cook vegetables the shortest amount of time for the desired tenderness.
For vegetables that have a skin, scrub well and cook with the skin on whenever possible.
When vegetables are cut, use a sharp knife and cut in the largest pieces that are desirable for the recipe.
Follow the recipe or directions for cooking a vegetable.
Cook vegetables just in time for serving on the line.
Basic Principles of Cooking Vegetables Meet Quality Standards
Green Vegetables
- When a green vegetable is cooked, some acid is released in the steam. When steam cannot escape, it condenses to water that has the acid in it. Then it falls back on the food turning it a dull olive-green color. This is why correct cooking and holding of green vegetables is so important to maintain the bright green color.
2. Orange and Yellow Vegetables
- During cooking, orange colored vegetables may become more yellow, but there is a little change. Follow the recipe or directions to avoid overcooking these vegetables because they will become mushy in appearance and in texture.
. Cook vegetables for good flavor typical of the vegetables.
- The flavor of the vegetable is affected by the way it is cooked and by the seasonings added to it.
4. Serve vegetables at the right temperature.
- By cooking vegetables just in time for serving, they do not have to be held long and will have better quality as well as maintain their temperature.
Classifications of Vegetables
Parts of a plant
Flavor
Colors
Nutrients in Vegetables
Vitamin A
Vitamin C
Vitamin B
Minerals
Carbohydrates
Thawing Frozen Vegetables
Set frozen vegetables in the refrigerator for slow, safe thawing that takes several hours or overnight.
Immerse vegetables, encased in plastic wrap or a glass container, in cold water that you change every minutes .
Microwave the vegetables which have been removed from their packaging, and process them on defrost about 30 percent powers according to weight
MARKET FORMS OF VEGETABLES
Fresh
Canned
Frozen
Dried
Methods of Cooking Vegetable Dishes
Moist- Heat Methods
Blanching-
Boiling
Braising
Poaching
Steaming
Dry- Heat Method
Broiling
Grilling
Roasting
Sauteing
Stir-frying
Preserving Nutrient of Vegetables
Leave vegetables in big pieces.
Always cover your pot to hold in steam and heat.
Use any leftover cooking water for soups and stews, sauces, or vegetable juices.
Eat fruits and vegetables raw whenever possible in salads and smoothies or as whole fruits and vegetables.
Cook vegetables until crisp.
Use as little water as possible when cooking.
This document describes importance of food preservation.
It clears basic concepts regarding factors responsible for food spoiling and importance of preserving food products
This presentation slides helps all of you to increase knowledge and understanding about different food preservation methods. It will be a great help to make a powerful presentation.
Preparing Vegetable Dishes Prepared by Ms. Leody C. Jumao-as
Learning Objectives:
Identify the market forms of vegetables
Prepares and present vegetable recipes with appropriate sauces and accompaniments
Basic Principles in Cooking Vegetables to Maintain Nutrients
Cook vegetables in the smallest liquid possible .
Cook vegetables the shortest amount of time for the desired tenderness.
For vegetables that have a skin, scrub well and cook with the skin on whenever possible.
When vegetables are cut, use a sharp knife and cut in the largest pieces that are desirable for the recipe.
Follow the recipe or directions for cooking a vegetable.
Cook vegetables just in time for serving on the line.
Basic Principles of Cooking Vegetables Meet Quality Standards
Green Vegetables
- When a green vegetable is cooked, some acid is released in the steam. When steam cannot escape, it condenses to water that has the acid in it. Then it falls back on the food turning it a dull olive-green color. This is why correct cooking and holding of green vegetables is so important to maintain the bright green color.
2. Orange and Yellow Vegetables
- During cooking, orange colored vegetables may become more yellow, but there is a little change. Follow the recipe or directions to avoid overcooking these vegetables because they will become mushy in appearance and in texture.
. Cook vegetables for good flavor typical of the vegetables.
- The flavor of the vegetable is affected by the way it is cooked and by the seasonings added to it.
4. Serve vegetables at the right temperature.
- By cooking vegetables just in time for serving, they do not have to be held long and will have better quality as well as maintain their temperature.
Classifications of Vegetables
Parts of a plant
Flavor
Colors
Nutrients in Vegetables
Vitamin A
Vitamin C
Vitamin B
Minerals
Carbohydrates
Thawing Frozen Vegetables
Set frozen vegetables in the refrigerator for slow, safe thawing that takes several hours or overnight.
Immerse vegetables, encased in plastic wrap or a glass container, in cold water that you change every minutes .
Microwave the vegetables which have been removed from their packaging, and process them on defrost about 30 percent powers according to weight
MARKET FORMS OF VEGETABLES
Fresh
Canned
Frozen
Dried
Methods of Cooking Vegetable Dishes
Moist- Heat Methods
Blanching-
Boiling
Braising
Poaching
Steaming
Dry- Heat Method
Broiling
Grilling
Roasting
Sauteing
Stir-frying
Preserving Nutrient of Vegetables
Leave vegetables in big pieces.
Always cover your pot to hold in steam and heat.
Use any leftover cooking water for soups and stews, sauces, or vegetable juices.
Eat fruits and vegetables raw whenever possible in salads and smoothies or as whole fruits and vegetables.
Cook vegetables until crisp.
Use as little water as possible when cooking.
Drying is a mass transfer process consisting of the removal of water or another solvent by evaporation from a solid, semi-solid or liquid. This process is often used as a final production step before selling or packaging products.
Food drying is a method of food preservation in which food is dried (dehydrated or desiccated). Drying inhibits the growth of bacteria, yeasts, and mold through the removal of water.
Dehydration has been used widely for this purpose since ancient times; the earliest known practice is 12,000 B.C. by inhabitants of the modern Middle East and Asia regions. Drying is a simple method for preserving food.
Dried foods make great healthy and tasty snacks. They are good for lunches, travel, backpacking, hiking, and camping plus many other activities. Most types of foods can be dried. Drying is an ancient method of food preservation.
PHYSICAL METHODS OF FOOD PRESERVATION.pptxAfra Jamal
This presentation includes the methods of food preservation by physical methods such as asepsis, preserve by low and high temperatures, biopreservatives, desiccation, controlled atmosphere and anaerobiosis
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2. Food preservation is a process of
slowing down food from becoming
bad.
Besides making the food lasts longer,
preservation also prevents food
wastage.
3. Food preservation also allows food
to be eaten out of season. It gives
variety and nutrition to our diet all
year round.
Freeze-dried food are easy to store
and transported because they are
light and require less space.
4. Durians, rambutans and starfruits can be
preserved in different ways.
Instant coffee, milk powder and curry poweder
are freeze-dried.
5. Bottling and canning are processes
of preserving food by heating and
then sealing it in an airtight
container.
The food is boiled to kill
microorganisms and then sealed to
prevent other microorganisms from
getting in.
6.
7. Pickling food in vinegar or other
acids, makes it difficult for
microorganisms to live.
Commonly pickled food include
onions, soyabeans and chillies.
8. Sugar can also be used in pickling
fruits such as mangoes and cherries.
The concentrated sugar solution
used draws water from the fruit thus
preventing the growth of
microorganisms.
9.
10. A lot of food is preserved by drying
under the sun.
Drying removes most water from
food. Most bacteria die or become
inactive when the food is dried.
12. A lot of fruit such as raisins, guavas
and papayas can be eaten dried.
13. Salting is an age-old way of
preserving food. The salt draws
out moisture and prevents
microorganisms from growing. In
this process, food such as fresh
fish are gutted, washed and
coarse salt is rubbed into it.
14. A lot of our local foods are
preserved by salting process.
15. Vacuum packing keeps food by
sucking air out from its
packaging.
Food is thus prevented from
spoiling because there is no air.
16. Vacuum paching is commonly used for storing
nuts, sliced fish, pickled and dried fruit.
18. Cooling slows down the action of
microorganisms, thus it takes
longer to spoil. It allows fruit from
different parts of the world to
appear on our supermarket shelves.
At freezing temperature,
microorganisms become inactive,
thus food cannot spoil when it is
frozen.
19. Food like meat, fruit and vegetables are kept
in the refrigerator.
20. Waxing of fruit and vegetables is also
common. Apples, oranges and tomatoes
are dipped into liquid wax to prevent
growth of fungi and loss of moisture.
Waxed fruit need to be washed thoroughly or
peeled before eating.
21. Pasteurization means heating food
to a certain temperature for some
time followed by rapid cooling.
Heating at such high enough
temperature kills most bacteria.
However, it does not affect the taste
and nutritional value of the food.
22. Fresh milk, yoghurt drink and juices are
pasteurized to make them last longer.
23. As food is heated and cooked, the heat kills
the microorganisms,
Boiling kills most bacteria. However, those not
affected by heat will grow when the
conditions are suitable.
Boiling kills bacteria
24. Smoking is the process of drying food with
smoke for a long period of time. This
method is mainly used for fish, meat and
fruit such as banana.
The drying effects of smoke and the
chemicals produced from the smoke help
to preserve the food.
Smoked banana smoked meat