lemon and limes are always great choices in cooking, but grapefruit, in my opinion is always underrated.  it has a very unique flavor that's almost a bit bitter, sweet, and tart all at the same time.  having said that, it works really well in sauces especially when mixed with something spicy.

(click on the photo for the recipe)

grillling shrimp on a well used cast iron pan gives the shrimp a really cool smokey flavor.

the shrimp is au natural, so the sauce really has to pull its weight.