Marinara Sauce (a basic recipe + tips for variations)

Ingredients

• olive oil
• 1 medium yellow or white onion, diced
• 2 large cloves garlic, minced
• 1/3 cup red wine (optional)
• 1 28 oz can fire-roasted diced tomatoes plus their juices
• 1 8 oz can tomato sauce
• 1 rounded Tbsp tomato paste
• 1/2 tsp Kosher salt
• 1/4 tsp freshly ground black pepper
• 2 tsp dried oregano
• 1 tsp dried basil
• 1/2 tsp red pepper flakes