For hollandaise sauce:
In a mixing bowl over a double boiler, whisk egg yolks until they thicken and become frothy—should form a ribbon when pulled up with the whisk. Remove from heat. Continue to whisk, adding clarified butter slowly in a steady stream. Adjust thickness with water if desired. Add seasonings and reserve on low heat—should be used within 4 hours.
For spinach mixture:
Saute scallion, celery, and fennel seed in butter for 2–3 minutes. Add water, let simmer for 3 minutes. Add spinach and seasonings. Cook for 5 minutes. Reserve.
Place spinach mixture on top of each oyster on the half shell. Pour some hollandaise on top of each. Bake in 350°F oven for 5 minutes. If desired, finish oysters under broiler until golden brown. We top ours with a sprinkle of shredded Jarslberg cheese.
Shaw’s Crab House