Melt some cooking fat in a large skillet over medium-high heat.
Cooking fat
Season the beef with salt and pepper all over. Brown the beef on each side, for about 2 minutes; set aside.
2 lb. beef sirloin, Sea salt and freshly ground black pepper
Add the carrots, garlic, and potatoes to the skillet and cook until soft, 5 to 6 minutes.
2 cups carrots, 2 garlic cloves, 2 to 3 sweet potatoes or white potatoes
Pour in the beef stock, add the mushrooms and steak to the skillet, cover, and simmer for 10 to 12 minutes.
1 cup beef stock, 1 cup baby portobello mushrooms
Add the grape tomatoes, and simmer another 5 minutes uncovered.
1 cup grape tomatoes
Season to taste with salt and pepper; serve with green onions sprinkled on top.
2 green onions, Sea salt and freshly ground black pepper