In a medium size bowl, stir together ingredients for the marinade including balsamic vinegar, Worcestershire sauce, olive oil, Dijon mustard, garlic powder, salt, and black pepper until well combined. Place your sirloin steaks in a large ziplock bag and pour this flavorful marinade over them ensuring they are fully coated. Seal the bag tightly and shake gently to distribute everything evenly before placing it in your fridge to chill for about 30 minutes.
While your steak is marinating, prepare the gremolata by combining minced basil leaves, parsley, lemon zest, and freshly minced garlic in a small bowl; mix them together well until they’re evenly distributed throughout the mixture.
Preheat either a cast iron grill pan over medium-high heat or an outdoor grill if available; drizzle your corn on the cob lightly with one tablespoon of extra virgin olive oil followed by generous sprinkles of salt and pepper for seasoning enhancement as it cooks on each side until beautiful grill marks appear—around ten minutes total should do!
Remove marinated steaks from refrigeration just prior to grilling; place them directly onto preheated grill or grill pan cooking each side for approximately four to five minutes depending on desired doneness—aiming towards rare or medium rare will yield optimal tenderness!