Season the steak to taste with sea salt and black pepper.
2 lbs. sirloin tip steak, Sea salt and freshly ground black pepper
Melt cooking fat in a skillet over medium-high heat and brown the steak for 4 to 5 minutes; set aside.
Cooking fat
Add more cooking fat to the skillet, lower the heat to medium, and add the onions.
2 onions
Cook, stirring, for 6 to 8 minutes; then, add the garlic and cook another minute or two.
2 garlic cloves
Add in the sliced tomatoes and season to taste with sea salt and freshly ground black pepper.
2 tomatoes, Sea salt and freshly ground black pepper
Pour the chicken or beef stock into the pan and cook, stirring, until the tomatoes are soft, 6 to 8 minutes.
½ cup beef or chicken stock
Add the steak back to the skillet; season with cumin and pour lime juice into the mixture.
1 tbsp. ground cumin
Toss everything and cook another 2 to 3 minutes.
Adjust seasoning as needed; serve topped with fresh cilantro and sliced lime.
Juice from 1 lime, Fresh cilantro to taste