Grilled Taco Burgers

Ingredients

• 1 lb ground sirloin
• 1 pkg taco seasoning
• 2 Tbsp. Fustinis' Espresso Bean balsamic vinegar
• 1 Tbsp tomato paste
• 1/4 Cup minced white onion
• 1 pkg smoked gouda cheese
• 1 pkg brioche buns
• 1 large tomato
• 1 head leaf lettuce
• Sour cream