How to prevent apples from turning brown as a result of oxidation
Place the apple pieces for 3 to 5 minutes in a bowl of cold water mixed with lemon juice (1 tablespoon of lemon juice to one cup of water). Drain and then rinse.
Freshness test for endives
Endives do not tolerate exposure to warm sunlight, and therefore rank as a typical winter vegetable. In order to be sure that endives are fresh, you should rub them together; if they make a squeaking sound, that means that they are still good and fresh.
A very simple way to crack walnuts
Place the walnuts for about one to two hours in the freezer compartment. The cold makes the shell porous, so the nuts can be cracked more easily and more quickly.