Homemade turkey burgers in crisp panini modernizes the classic patty melt. Opt for dark meat, as it will stay juicier when you cook it. Take your time caramelizing the onions—they're worth the wait.
Heat 1tbsp of the oil in a sauté pan over medium heat. Add the onion and cook, stirring, until it begins to brown, 4–5 minutes. Reduce the heat to medium-low and continue cooking until the onion is soft and golden, 25–30 minutes more. Season with salt and pepper and set asid