An easy and delicious dinner! Rice with vegetables and mushrooms!

Ingredients:
Mushrooms - 300 g.
vegetable oil
Onion - 1 pc.
Paprika - 1 pc.
Salt
Black pepper
Sauce:
Brown sugar - 1 tsp
Rice vinegar - 1 tbsp
Soy sauce - 3 tbsp.
Ketchup - 1 tbsp
Garlic - 1 clove
Boiled rice - 300 g.