Step 1

Place the chuck steak in the slow cooker.

Step 2

Mix the broth, vinegar, tomato sauce, lime juice, and spices together.

Step 3

Pour the mixture over the steak.

Step 4

Finely chop the onion and place half of the amount in the slow cooker with the steak.

Step 5

Cook on low for 5 hours (or until fork-tender).

Step 6

Heat the tortillas and top each one with lettuce, tomatoes, sliced avocado, the remaining onion, and crumbled feta.

Step 7

Slice the cooked chuck steak and add to each tortilla.

Step 8

Serve and enjoy!