Steamed PEI mussels dipped in melted butter July 15, 2019 1000 × 667 Lobster Suppers – A Time-honoured PEI Tradition Steamed PEI mussels dipped in melted butter at Fisherman’s Wharf Lobster Suppers Steamed mussels are a common appetizer at PEI lobster suppers. Always served with melted butter.