Drizzle grill pan with olive oil.
By hand, mix together the Kerrygold butter, pepper, onion, garlic, and cilantro. Put it in the refrigerator while you are preparing the tilapia.
Mix together bread crumbs and flour in bowl.
Lightly coat tilapia with the bread crumb/flour mixture.
Place tilapia on the grill pan.
Top each filet with 1-2 dollops of the compound butter.
Grill at around 400-500 degrees until just done.