How do you cook kohlrabi?

Chocolate chip cookies.... little easy desserts...veggies....potatoes. You could also have a go at a traditional dish like shepher'd pie or spag bol if you have a good recipe.

Basically, a pastry chef cooks pastries. I don't want to be so blunt here. Pastries are food items that are prepared through baking. Cakes, pies and similar dishes would be examples.

You can, but it isn't necessary, you can just wash them remove the large stems cut them up let them dry then put them in zip lock bags seal them up forcing as much air out of the bag before putting...

No

Because cooked foods are easier to digest, and can be kept longer than raw foods.