Cheese Tartlets - BelGioioso Cheese

Ingredients

• 2 Tbsp. (28 grams) unsalted butter
• 3/4 cup (108 grams) chopped yellow onion
• 2 Tbsp. (20 grams) chopped seeded jalapeño
• 1 1/2 lbs. (681 grams) plum tomatoes, finely chopped
• 3 Tbsp. (36 grams) granulated sugar
• 3 Tbsp. (42 grams) firmly packed dark brown sugar
• 2 Tbsp. (30 grams) distilled white vinegar
• 1¼ tsp. (3 grams) kosher salt
• ½ tsp. crushed red pepper
• ½ tsp. (1 gram) ground black pepper
• 1/2 cup (113 grams) unsalted butter, softened
• 1/2 cup (47 grams) grated BelGioioso Parmesan cheese
• 1/2 cup (65 grams) shredded BelGioioso Baking Fresh Mozzarella cheese
• 1 large egg yolk (19 grams), room temperature
• 2 tsp. (2 grams) minced fresh rosemary
• 1/2 tsp. (1.5 grams) kosher salt
• 1/2 tsp (1 gram) ground black pepper
• 1 1/4 cups (156 grams) all-purpose flour
• 2 oz. (56 grams) BelGioioso Baking Fresh Mozzarella cheese, torn into small pieces