This salad is great and easy; give it a try.
1 yellow onion
3 Tbsp oil
2 lb fresh mushrooms or 2 cans mushrooms
1 can peas
2 Tbsp mayonnaise
1 pinch salt
1 pinch ground black pepper
Chop onions and saute in oil. When onions are soft, add mushrooms and saute till soft and cooked well. Add peas to saute for just a few minutes to garnish flavor.
Allow everything to completely cool. Add mayo, salt and pepper to taste.