Greek Moussaka Burger with Lamb, Béchamel, and Eggplant - Yummy Gusto

Ingredients

• 500 g ground lamb, preferably organic
• 2 cloves garlic, finely minced
• 1 teaspoon ground cumin
• Salt and freshly ground black pepper, to taste
• 2 tablespoons unsalted butter
• 2 tablespoons all-purpose flour
• 240 ml whole milk
• Pinch of freshly grated nutmeg
• 1 large eggplant, sliced into 1 cm rounds
• Olive oil, for brushing
• 4 medium burger buns, toasted
• Fresh mint leaves, for garnish