homemade curry sauce

1 tablespoon olive oil
2 onions
2 cloves of garlic
2 red bell peppers
200g tomato paste
1/2  chili pepper
1/2 l vegetable broth
2 teaspoons paprika powder
1 teaspoon curry powder
1 teaspoon brown sugar
salt to taste

Chop onions, garlic and bell peppers. Sweat them in olive oil in a thick sauce pan. Add the remaining ingredients and continue cooking on low heat for 15 minutes.
Puree the sauce in a blender and add salt to taste. Sprinkle with curry powder.