04Char the peppers over an open flame on the stovetop or under a hot broiler (once the onions and garlic are removed). Place the charred peppers in a bowl, cover and cool to handle. Wipe away the pepper skins with a towel. Seed and coarsely chop.
05Cool the garlic to handle, and then squeeze the garlic cloves away from the skins and into a food processor bowl. In two batches, add the onions, garlic, peppers, stock and tomatoes. Puree until fairly smooth. Add the puree to a pot with the passata and season with the herbes de Provence and add the torn basil. Heat the soup through and simmer to thicken a little and combine flavors, about 20 minutes. Adjust the salt and pepper. Cool and refrigerate for a make-ahead meal.
06For the grilled cheese croutons:
07To serve, heat the soup over medium heat and preheat a griddle pan over medium heat. Butter all the bread on one side with the softened butter. Make the cheese sandwiches with the buttered sides facing out. Grill the sandwiches until golden and crisp on each side. Dice into bite-size squares. Serve the soup in shallow bowls and top each with a few grilled cheese croutons.
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Not rich — missing servings, total time, or calories.