Take the chorizo out of the casing and crumble it up.

Saute it with the onions, bell peppers and cilantro; drain off fat. Cool the mixture.

Put a mussel on one corner of a 6" x 6" square of filo; place a mound of Chorizo mixture on top and roll forward, tucking in the "wings" of the dough as you go.

Repeat with remaining mussels, mixture, and filo.

Place on a cookie sheet and drizzle with melted butter.

Bake at 400° for 15 minutes or until brown.