Indian Lamb Burgers with Green Raita Sauce and Red Onions

lbs Ground lamb

Baby spinach, leaves

Cilantro, leaves

Garlic

1-inch piece Ginger

Lime

Mint, leaves

thick 4 (1/2-inch thick) slices Red onion, small

Red or green chile

Cinnamon, ground

Salt

Salt and freshly ground black pepper

Olive oil, Extra-virgin

Potato rolls or slider rolls, soft

Greek yogurt, plain

1 teaspoon (1/3 palmful) turmeric, ground cumin, ground coriander, smoked sweet or sweet paprika, granulated onion or onion powder*