Lemon juice gets very smokey, but it makes things oh-so-good. Things like, oh... shrimp, or perhaps bacon-wrapped asparagus
Emeril's chicken apple sausage (probably other brands of chicken-apple too) are EXCELLENT cooked on the grill
Mustard onion:
Take a yellow onion, cut it down toward the base in many sections, open it up a bit, squeeze some mustard down in all the cuts, then pack that sucker full of brown sugar. Wrap it up in tinfoil and cook until soft (about 1/2 hour or more). Great alone or as sandwich topping for the above-mentioned sausages.