Homemade Ketchup

INGREDIENTS

• 2 tbsp olive oil
• 1 medium onion, chopped
• 1 clove garlic, chopped
• 1 28-oz can tomato purée
• 1/2 cup brown sugar
• 1/4 cup apple cider vinegar
• 1 tbsp tomato paste
• 1 tsp kosher salt
• 1/2 tsp ground mustard
• 1/8 tsp ground cloves
• 1/4 tsp allspice
• 2 tsp red pepper flakes
• 1/2 tsp cayenne pepper