01 -
Halve the bell peppers, remove the seeds and core, and chop into ¼-inch wide strips. Slice the onion into thin rings. Chop the garlic finely after peeling.
02 -
Gently warm olive oil in a skillet over medium-low heat. Toss in the onions and cook for about 5 minutes, stirring now and then until softened. Add your chopped garlic and cook an extra 5 minutes, ensuring nothing browns.
03 -
Stir in the bell pepper slices and let them cook gently for 10 minutes. Then pour in the tomato puree along with half the salt and a sprinkle of black pepper. Stir it all together, cover the skillet, and simmer for 30-40 minutes, giving it a good stir occasionally.
04 -
Take off the lid and mix in the white wine vinegar and sugar. Let it simmer uncovered for around 10 minutes until the sauce reduces slightly and the peppers become tender. Taste the mixture and add a pinch of extra salt if needed. Serve either warm or at room temperature.