Prepare the duck breasts by scoring the skin in a crosshatch pattern, being careful not to cut into the meat. Season both sides generously with salt and pepper.
In a hot skillet over medium heat, place the duck breasts skin-side down and cook for 5-6 minutes, until the skin is crispy and golden brown. Flip and cook for another 3-4 minutes. Remove from the heat and let rest for 5 minutes.
Thinly slice the red onion. In a skillet, heat the olive oil, add the onion, and drizzle with balsamic vinegar. Sauté for 5 minutes, or until the onion is softened and slightly caramelized.
Toast the burger buns in a skillet until the inside surfaces are golden brown.
Assemble the burgers: spread orange marmalade on the bottom bun, top with lettuce leaves, sliced duck breast, brie cheese, and caramelized red onion.
Cover with the top bun and gently press down. Serve immediately, with a side of fries or sweet potato fries.
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