lemons, for serving
4 tbsp. salted butter, for frying, plus more as needed
1 lb jumbo lump crabmeat, picked for shells but leave lumps intact
8 saltine crackers, crushed into crumbs
2 large or 4 small scallions, green parts only, very thinly sliced
2 tsp. Worcestershire sauce
1 tsp. mustard powder
2 tsp. Old Bay seasoning
1/2 cup mayonnaise
1 egg