In a large bowl, add the next 6 ingredients (grass fed butter through pepper); mix well and submerge steaks in mixture. Cover bowl and let sit overnight in the refrigerator, or at room temperature for 1 hour.
In a large pot, add broccoli, zucchini, onion and bone broth. Over medium-high heat, bring to boil and stir occasionally for 10 minutes, or until veggies are softened. Remove from heat, season with salt and pepper to taste, and set aside.
In a large skillet, heat the ghee over medium-high heat.
Place marinated sirloin steaks into the hot skillet and cook for 3 to 5 minutes per side, or to desired doneness. Set aside 4 steaks for lunch the next day (Chopped Marinated Steak and Olive Salad). Serve remaining steaks with veggies.