Caramelized Onion Tomato Sauce

This is an easy sauce to make when you have nothing left in the fridge. I prefer to use red onions since I find they caramelize better. Note that real caramelized onions take about 1 hour to cook on low heat. In this recipe, the onions cook for only 35 minutes, which is fine since they are incorporated in the sauce. As for the spices, I used rosemary, oregano and Herbes de Provence, but you can use whatever you like in the amounts you like.

Ingredients

2 tablespoons butter
2 tablespoons olive oil
1 or 2 large red onions, thinly sliced
1 garlic clove, minced
1 796 ml (28 oz) can diced tomatoes
1/4 teaspoon dried rosemary
1/8 teaspoon dried oregano
1/8 teaspoon Herbes de Provence
Salt and pepper
Grated parmesan cheese

Directions

1. In a skillet, heat olive oil and butter on medium heat. Add onions and some salt and cook for 10 minutes, stirring often. Reduce heat to medium low and cook onions until golden in colour and tender, about 25 minutes.
2. Add garlic, tomatoes, and spices to onions. Add salt and pepper and simmer with lid off for about 20 minutes. Adjust seasoning to your own liking.
3. Serve sauce over penne and add grated parmesan cheese.