Ingredients

1 lb. sirloin, cut into into 1" pieces

2 tbsp. chopped rosemary, divided

4 tbsp. olive oil, divided

1 lb. baby Yukon gold potatoes

2 tbsp. dijon mustard (or whole grain mustard), divided

Steak sauce, for serving (optional)

Preparation

Step 1Preheat grill to medium-high. Soak skewers for 20 minutes.Step 2Toss steak with 2 tbsp. olive oil and 1 tbsp. rosemary. Season with salt and pepper to taste. Let marinate while you prepare the potatoes. Step 3Place potatoes in a large microwave-safe bowl. Cover and microwave on until just tender, about 6-8 minutes. Set aside until cool enough to handle. Toss with 2 tbsp. olive oil, 1 tbsp. rosemary and mustard. Season with salt and pepper to taste.Step 4Thread steak and potatoes onto skewers. Grill, turning occasionally, until steak is medium, 8 minutes. Step 5Serve with steak sauce, if desired.