Preheat the oven to 200°C (fan forced)
Cream the butter and almond meal; grate in the garlic and add the Grand Marnier. Also add a pinch of cayenne pepper. Mix well to combine.
Pour off the extra liquid from the oysters and cover each with a tsp of the almond mixture.
Bake in the oven for 5 minutes.
Serve immediately garnished with a pinch of cayenne pepper