Peel the onions, finely chop and pour hot water to remove the bitterness. Allow to stand 10 minutes, drain the water and carefully squeeze the onion. You can use pickled onions. To make the dressing. Mix oil, salt, pepper, Melissa and garlic powder.
Cheese cut into small cubes. Mushrooms, if you take fresh, clean and wipe with a damp cloth and cut into small slices. (I took canned goods.)