Preheat the broiler to 500 degrees, and mount a rack about three inches below the heat.
Place the oysters on a baking sheet or pizza pan, with a gap about as wide as your finger between them.
Mix butter with the garlic, Cajun seasoning, dill, and salt. Put about a tablespoon of the mixture atop each oyster.
Sprinkle the oysters with about 1 tsp. of the parmesan-romano cheese mixture. Drizzle the lemon juice and the wine across the whole pan.
Put the pan under the broiler and broil at 550 degrees until the oysters start to plump up and the butter starts to sizzle. Serve immediately, with lots of toasted French bread rounds.
