Maybe not a traditional Cinco De mayo dish... however 26 years ago this was the day I asked my wife to marry me, and she likes filet mignon.
The parsley butter provides a bright flavor to the savory filet...
Following recipe comes from Jamie Purviance's "Weber's Real Grilling" book:
4 tbs unsalted butter
1 tbs finely chopped fresh parsley
1/4 tsp fresh lemon zest
1/4 tsp kosher salt
1/4 tsp freshly ground pepper
Just grill those Filet's with salt and pepper and top with the above recipe...the potatoes are actually drizzled with the Pepito Cilantro dressing I made the day before... fantastic!