Answer:
50 g onions
30 g carrots
1 tablespoon of oil
200 g tomatoes
300 ml vegetable stock
Step-by-step explanation:
Divide all the quantities by 3
150/3 g onions
90/3 g carrots
3/3 tablespoons of oil
600/3 g tomatoes
900/3 ml vegetable stock
For one portion:
50 g onions
30 g carrots
1 tablespoon of oil
200 g tomatoes
300 ml vegetable stock