📖 Instructions

1. Prepare the Onions: Thinly slice two large yellow onions. In a large skillet, melt 2 tablespoons of butter over medium-low heat. Add the sliced onions and cook, stirring occasionally, for 25-30 minutes, or until they are deeply golden brown and caramelized. This takes patience, but don’t rush it! If the onions start to burn, reduce the heat slightly and add a tablespoon of water. They should be a rich, brown color.
2. Prepare the Beef: While the onions are caramelizing, slice 1.5 pounds of beef sirloin into thin strips against the grain. This will ensure the beef is tender and cooks evenly. Pro-tip: Partially freezing the beef for about 30 minutes makes it easier to slice thinly.
3. Make the Dijon Mustard Sauce: In a small bowl, whisk together 3 tablespoons of Dijon mustard, 2 tablespoons of soy sauce, 1 tablespoon of honey, 1 teaspoon of minced garlic, and 1/4 teaspoon of black pepper. Set aside.
4. Cook the Beef: Heat 1 tablespoon of vegetable oil in a large wok or skillet over high heat. Add the beef strips and stir-fry for 3-5 minutes, or until browned on all sides and cooked through. Be careful not to overcrowd the pan; cook the beef in batches if necessary. If the beef releases too much liquid, drain it off.
5. Combine and Simmer: Add the caramelized onions to the skillet with the beef. Pour the Dijon mustard sauce over the beef and onions. Stir well to coat everything evenly. Reduce the heat to medium-low and simmer for 5-7 minutes, or until the sauce has thickened slightly and the flavors have melded together. Maybe add a little red pepper flakes for a kick.
6. Serve: Serve the Dijon Mustard Beef Stir-Fry hot over rice, quinoa, or noodles. Garnish with chopped green onions or sesame seeds, if desired. A side of steamed broccoli or asparagus would also be a great addition. I just love the way the flavors explode together in my mouth.