Cut the peppers into wide strips and place them skin up under the preheated grill until the skin turns black and bubbles form. Then place in a damp kitchen towel and let cool down. When cold, peel off the skin and cut the peppers into thin strips. Chop the anchovy fillets and the onion and fry them in a pan with the peppers. After about 2 minutes, add the vegetable stock and white wine. Let simmer briefly. Add tomato paste and season with pepper.