Mashed potatoes with peas, corn, and mushroom sauce / Pure con arvejas, choclo, y salsa de champiñones

Ingredients:
-potatoes
-peas
-corn

for the sauce:
-mushrooms
-onion
-soy sauce
-milk (I used unsweetened almond milk)
-vegan margarine
-flour

Preparation:
-cook the peas and corn
-make you mash potatoes
-for the sauce, saute the onions and mushrooms in a pan with the margarine. Then add the milk and flour depending on how thick you
want it, and stir, add 2 spoons of soy sauce.