Thai Chicken Slaw Burgers

Ingredients (14)

• + 8 hamburger buns, split add to pantry
• + 2 tablespoons butter add to pantry
• ✓ ½ onion, chopped
• + 2 tablespoons tomato paste add to pantry
• + 2 cloves garlic, minced add to pantry
• + 3 tablespoons Thai sweet chili sauce, or more to taste add to pantry
• + 1 tablespoon Worcestershire sauce add to pantry
• + 1 teaspoon white sugar add to pantry
• + 2 pounds boneless, skinless chicken breast, or more to taste, cut in bite-size pieces add to pantry
• ✓ 2 tablespoons olive oil
• + 3 tablespoons sweet pickle relish add to pantry
• ✓ 3 tablespoons lemon juice
• + 2 tablespoons honey add to pantry
• + 2 cups coleslaw mix add to pantry