Heat the oil in a large skillet over medium heat. Add onions and saute until translucent but not browned, about 7 minutes. Sprinkle with paprika and saute the onions until they are deeply colored.
As the onions begin to brown, add the peppers and continue to saute, stirring every few minutes, about 10 minutes. Do not allow to brown.
Stir in tomatoes, paste, broth, and salt and pepper. Bring to a boil, reduce heat, cover and simmer until pepper become tender, about 35 minutes, adding a little broth as it evaporates, if needed.
Remove from heat, stir in sugar, vinegar, and then allow the to cool.
Serve right away, or refrigerate until needed.
Can be served at any temperature, warm or room temperature.
For a variation, you can use roasted red peppers, reducing cooking time to suit.
Yield: 4 servings