Melt the butter in a Dutch oven or heavy-bottomed saucepan over medium heat.
6 tbsp butter
Add the lump crabmeat and stir gently, taking care not to break up the larger pieces.
1 lb lump crab meat
Pour in the heavy whipping cream and milk. Increase the heat to medium-high and cook, stirring frequently, just until the soup begins to simmer. Do not allow it to reach a rapid boil.
2 cups heavy whipping cream, 2 cups milk
Reduce the heat to low and simmer gently for 20 minutes, stirring occasionally.
Remove the soup from the heat and stir in the cooking sherry. Taste, then season with salt and black pepper as needed.
1 tbsp cooking sherry, Salt and pepper
Serve warm with fresh lemon wedges and saltine or oyster crackers.
Lemon wedges, Saltine or oyster crackers