Heat some oil, honey, and a splash of balsamic vinegar in a pan over medium heat for 1-2 minutes until the honey dissolves.
Add the onion rings and fry for 5-7 minutes, stirring occasionally, until translucent. Remove from pan and keep warm.
Mix the minced beef with dried Italian herbs, salt, and pepper until evenly combined. Form 4 flat burgers and press a shallow hollow in the center of each.
Cut the tomato into slices and cut the mozzarella into slices.
Wash the lamb's lettuce and pat dry thoroughly.
Toast the burger bun halves in the oven at 180°C (350°F) for 2-3 minutes until lightly golden.
Heat a little oil in the pan over medium-high heat. Fry the burgers for 3-4 minutes on the first side.
Flip the burgers. Immediately top each burger with tomato slices and mozzarella slices. Cook for 4-5 minutes until the cheese melts and the burgers reach your desired doneness.
If desired, carefully flip the burgers cheese-side down for 1-2 minutes to lightly brown the cheese.
Brush the toasted buns with your chosen sauce (pesto or ketchup and mayonnaise).
Place a generous layer of lamb's lettuce on the bottom half of each bun. Top with a burger, cheese side up. Garnish with the fried onions.
Place the top half of the bun on top and secure with a toothpick if needed.
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