My Grandmother's Tomato Gravy

Ingredients

• 2 cups fresh, ripe tomatoes, chopped
• 1 medium onion, finely chopped
• 2 cloves garlic, minced
• 2 tablespoons olive oil
• 1 teaspoon salt
• 1/2 teaspoon black pepper
• 1 teaspoon sugar
• 1/2 teaspoon dried oregano
• 1/2 teaspoon crushed red pepper flakes (optional)
• Fresh basil, chopped (for garnish)
• Chopped green onions (for garnish)