In a bowl, combine the unsalted butter, crushed garlic, dried tarragon, and lemon zest. Stir to combine well, then set aside.
Mix together the slaw ingredients by combining the sliced cabbage, fennel, dijon mustard, white wine vinegar, fennel seeds, and mayonnaise. Stir to combine well. Set the slaw aside.
Dice the sirloin steak and place it onto the skewers. Brush the steak with half of the prepared garlic and tarragon butter mixture.
Cook the steaks either on the grill or a chargrill on high heat. Cook for 6 - 9 minutes.
Serve the beef skewers with the fennel slaw and the extra garlic and tarragon butter mixture. Enjoy!
Notes
This makes a total of 6 servings of Keto Garlic & Tarragon Beef Skewers with Fennel Slaw. Each serving comes out to be 506 calories, 35.8g fat, 5.1g net carbs, and 37.5g protein.