Place tomatoes in a colander, generously sprinkle with equal parts salt and sugar and let drain for 2 hours.
Puree the chili peppers, capers, garlic, basil and 2 tablespoons of salt with tomatoes and oil in the food processor (or with the hand blender). Fill the sauce into twist-off glasses, chill and let steep for at least 2 days until the first consumption.
The sauce can be used instead of Tabasco or other hot sauces, it will keep for around 1 year in twist-off glasses.