Grilled Steak With Herbs without fish basil

1/2 cup olive oil 6 tablespoons white balsamic vinegar 1 3/4 teaspoons dry mustard, divided 1 tablespoon dark brown sugar 1 2-pound well-trimmed tri-tip beef[...]

4 plum tomatoes , halved lengthwise 3 tablespoons olive oil kosher salt and pepper 1 lb london broil beef , sirloin or 1 strip steak 2 medium onions , sliced[...]