Colombian Beef Stew Recipe (Carne Guisada)

For the Carne Guisada

• 2 tablespoons vegetable oil
• 1 1/4 pounds stew beef
• 3 cups chopped ripe tomatoes about 4 tomatoes
• 2 cups chopped yellow onion about 2 medium onions
• 4 tablespoons minced garlic 
• 3/4 teaspoon ground cumin
• 1/2 tsp ground cayenne pepper
• 2 cups beef broth
• 1 tablespoons white vinegar
• 1 pound baby red potatoes cut into uniform bite-sized pieces

For the Creamy Avocado-Cilantro Sauce

• 1/2 of a large ripe avocado
• Juice of half of one lime
• 1/2 cup cilantro leaves and stems
• 1 scallion green onion
• 1/4 teaspoon salt
• 4 tablespoons extra virgin olive oil