Chop all greens fine and mix with margarine and half of bread crumbs. Reserve remaining bread crumbs. Add remaining ingredients, except fish pieces, and blend thoroughly. Drain gefilte fish, slice in half, and place in oven-proof shell shaped ramekins. Set shells in pan of hot, coarse kosher rock salt. Spread sauce over fish pieces and sprinkle with remaining bread crumbs. Bake at 450- F. abt. 25 min.; then place under broiler to brown.