What could be easier? Rub on beef, let the meat sit at room temperature for 30-45 minutes, and cook on the grill.
4 Tbsp dried porcini mushrooms
2 Tbsp granulated garlic
4 Tbsp black pepper
1 tsp kosher salt
In a spice blender, grind mushrooms to a fine powder. Then, in a bowl, mix all ingredients. Store in an airtight container.