Unlock Dazzle Beach and gather an Oyster from the shoreline.
Harvest a Lemon from trees in the Forest of Valor or Glade of Trust.
Go to a cooking station.
Combine the Oyster, Lemon, and 1 Coal to cook the Oyster Platter.
Notes
You don’t need to add water or extra ingredients, as the dish is straightforward to prepare. Ensure you’ve gathered enough Coal to cook recipes in bulk if needed.