Combine melted butter and lemon juice in a shallow dish and dip the fillets in the mixture. Place on a lightly greased ovenproof pan. Broil under high heat about 2 minutes each side, basting with the butter/lemon mixture several times during the cooking process. After the final baste, top fillets with sesame seeds. Broil an additional 1-2 minutes until the seeds are golden brown.
Source: Tropical Aquaculture Products, Inc.