Just did a few "london broils" on the grill. That's Top Round I believe. Marinate in ... lemon juice (enough to coat), a few good shakes of worcestershire sauce, enough salt and pepper, a couple tablespoons of olive oil, and your choice of either garlic or diced onions (enough to coat) -- for AT LEAST TWO DAYS (flip every time you go into the fridge for something). Grill 7-10 minutes each side. Let rest... slice thin on the bias. The secret is in the lemon juice... everyone said "it tastes kind of like a marinate in Italian Dressing, but not quite... something's different, and I LIKE IT"
You can also take potatoes, slice 3 slits in each and each slit add a sliver of fresh garlic, an onion slice, and a tab of butter. Sprinkle with salt then double wrap these in aluminum foil and put on the grill for about 45 minutes. It's like baked potatoes but better.
I make my own barbecue sauce, but it's always different depending on what I have on hand.
Any type of marinade similar to the above is great on Chicken breasts too. You can also slice potatoes through, coat with a little oil, salt and pepper and grill them right up. They turn out crispy... it's like grilled fries and they cook in about the same amount of time as a grilled chicken breast.
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