Red Pepper Tomato Sauce

Bahan-bahan (8 porsi)

• 3 tablespoons extra-virgin olive oil
• 1 medium onion, (finely chopped)
• 4 large (or 5 medium) red bell peppers, (seeded and thinly sliced)
• 2 large tomatoes, (peeled, seeded and finely chopped)
• ½ whole canned chipotle chile in adobo sauce, (coarsely chopped (add a whole one for more spice))
• 1 bunch fresh basil, (coarsely chopped)
• salt and freshly ground black pepper, (to taste)