Alzina's Spicy Brown Sugar Shrimp

Ingredients

• 1/2 stick unsalted butter
• 2 tbsp. olive oil
• 1/2 small onion, chopped
• 5 cloves garlic, peeled and sliced
• 1 tbsp. tomato paste
• 3 tbsp. tomato sauce
• 1 tbsp. brown sugar (or more or less to taste)
• 1 cup chicken stock, preferably homemade,
• or quality store-bought, such as Kitchen Basics brand
• 2 lbs. medium shrimp, peeled
• salt and red pepper flakes, to taste
• 1/2 cup sliced green onions
• 1/4 cup flat-leaf parsley, chopped
• hot cooked rice or hot French bread, for serving