Preheat large, nonstick sauté pan 2–3 minutes on medium-high. Chop vegetables. Place oil and beef in pan; cook 3–4 minutes, stirring occasionally, until browned and 145°F. Remove beef from pan. Add ...
Squeeze lemons for juice (1/4 cup). Place in large sauté pan: onions, 1 cup broth, tomato paste, mustard, lemon juice, vinegar, Worcestershire, salt, and pepper; stir until combined. Bring to a boil ...