1-First Step: Mix the marinade Start by grabbing a resealable plastic bag. Add the red wine vinegar, olive oil, the 1 tbsp unspecified ingredient, all four 1 tsp unspecified ingredients, and the salt. Seal the bag and shake it well so the marinade comes together. This kind of marinade works best when the oil and vinegar are fully mixed. It helps coat the meat and gives every cube a strong flavor base. If you like a deeper steak flavor, you can also pair this meal with one of our easy steak marinade ideas from Homemade Tasty for other grilling nights.

2-Second Step: Add the beef Place the 1.5 pounds of sirloin cubes into the bag with the marinade. Press out as much air as you can, then seal it tightly. Move the bag around until every piece of beef is coated. Sirloin is a great cut for kabobs because it cooks fast and stays tender if you do not overcook it. If you want to use a different cut, tenderloin or filet mignon are good upgrades, though they cost more.

3-Third Step: Marinate in the fridge Put the bag in the refrigerator and let the beef marinate for 4 to 12 hours. The recipe works best at the full time, with about 6 hours being a sweet spot for flavor and tenderness. Turn the bag halfway through so the marinade reaches every side. Do not skip this step. A short marinade gives you some flavor, but the longer soak gives the beef a much better taste and texture. If you are planning ahead for a weekend cookout, this is a great make-ahead step.

4-Fourth Step: Prep the vegetables and skewers While the beef marinates, get the peppers, mushrooms, and onion ready. Cut everything into skewer-friendly pieces so they cook in the same amount of time as the steak cubes. Thread the marinated beef and vegetables onto skewers, alternating the ingredients for a nice mix of flavor and color. If you are using wooden skewers, soak them first so they do not burn. Metal skewers also work well and are easy to reuse. Keep the pieces snug but not packed too tight so the heat can move around each kabob.

5-Fifth Step: Grill the kabobs Preheat the grill to medium-high heat. Brush the grates with oil so the meat does not stick. Place the kabobs on the grill and cook them for 5 to 10 minutes, turning them occasionally and basting with the marinade as they cook. For the best result, aim for about 4 to 5 minutes per side. The exact time depends on the heat of your grill and the size of your steak cubes. Pull them when the beef is cooked the way you like it and the vegetables are lightly charred.

6-Sixth Step: Broil if you are cooking indoors If grilling is not an option, turn on the broiler to high. Place the kabobs on a baking sheet and broil them for 5 to 10 minutes per side, turning and basting until the beef is cooked through. Broiling works well when you want a quick indoor meal with a grilled-style finish. Keep the kabobs a few inches from the heat source and watch them closely, since broilers can cook fast. This is a good choice for cold nights or when you want a no-fuss dinner with less cleanup.

7-Final Step: Rest and serve Let the kabobs rest for a few minutes before serving. This helps the juices settle back into the meat. Serve them hot, straight off the skewers, or slide the beef and vegetables onto a plate with your favorite side salad or cauliflower rice. These kabobs fit many eating styles, from keto to high-protein meal plans. They also work well for gatherings since people can build their own plate with the pieces they like most.