Lamb Sliders

Ingredients

• 1 tablespoon minced garlic
• 1/4 teaspoon ground cumin
• 1/4 teaspoon ground coriander
• 1/4 teaspoon ground allspice
• 1/4 teaspoon salt, or to taste
• 1/4 teaspoon ground black pepper, or to taste
• 1 pound ground lamb
• 8 small slider-size rolls, split
• 1 cup baby spinach
• 1/2 cup tzatziki sauce
• 1/4 cup sliced red onion
• 1/4 cup crumbled feta cheese