Roasted Spaghetti Squash with Red Pepper - Tomato Sauce

Ingredients

• 1 medium spaghetti squash
• 3 large or 4 small red bell peppers
• 3 tablespoons olive oil
• 1 large red onion, chopped
• 3 cloves garlic, minced
• 1 - 28 oz. can diced tomatoes
• 1/2 teaspoon dried oregano
• 1/2 teaspoon dried basil
• 1 or 2 tablespoon(s) sherry vinegar
• Pinch of red pepper flakes
• Kosher salt
• Freshly ground black pepper
• Fresh basil, for garnish (optional)