The secret to making less expensive cuts of meat tender is a good marinade. This one fits the bill. Mix up soy sauce, vegetable oil, ketchup, oregano, and three cloves of garlic, and then marinate the meat overnight. Grill, and slice on the diagonal.
Marinated Grilled Vegetables - zucchini, squash, mushrooms, tomatoes, red bell pepper, yellow bell pepper and red onion marinated in olive oil, soy sauce, lemon juice and garlic. Marinate veggies for 30 minutes and grill. Ready in about 15 minutes! SO easy and SO delicious! Everyone loves these vegetables! Use leftovers in a quiche.
Basic Marinade Formula by buzzfeed: ACID (but not too much) eg: vinegar, lemon/lime/orange juice, wine, buttermilk, or yogurt (why: tenderize protein to let the other flavor-enhancing ingredients get in there) + SALT or soy sauce (why: also tenderizes) + OIL eg, olive oil, canola oil (why: helps release the flavor of spices or herbs and hold them in contact with the meat) + HERBS/SEASONINGS/SUGAR eg, garlic, rosemary, ginger, chiles, maple syrup (why: adds flavor) + TIME #Marinade