Step 1

Trim fat from meat. Cut meat into 3/4-inch pieces. In a large skillet, heat oil over medium-high heat. Cook half of the meat in hot oil until brown; remove meat from skillet. Repeat with the remaining meat. Drain off fat.

Step 2

Transfer meat to a 3 1/2- or 4-quart slow cooker. Stir in drained beans, tomatillos, onion, undrained chile peppers, garlic, cumin, and salt. Pour broth over mixture in cooker.

Step 3

Cover and cook on low-heat setting for 6 to 7 hours or on high-heat setting for 3 1/2 to 4 hours.

Step 4

Stir in spinach and lime juice. If desired, top each serving with sour cream and/or cilantro.