Combine the oyster liquor, clam juice and chicken stock to form a broth; set aside.
In your favorite soup pot over medium heat, brown the bacon until fat is rendered and bacon is golden brown. Remove bacon with slotted spoon to paper towel-lined dish; set aside for garnish.
Pour off all but 1 tablespoon of bacon fat from pot. Add the butter. Add sliced leeks, saute till soft, 5 to 7 minutes. Add bay leaf and garlic. Saute 30 seconds more. Add reserved broth and potatoes to pot. Bring to boil and then simmer until the potatoes are tender on outside but still firm on the inside, about 10 to 12 minutes.
Smash a few of the cooked potatoes with spoon to thicken broth. Add nutmeg, lemon zest, lemon juice and salt and pepper to taste. Add the cream, bring back to a simmer and stir in the spinach. Cook until just wilted.
Add the oysters and a nice pinch of red pepper flakes. Cook for another 3 to 4 minutes until oysters are done.
Serve immediately or, if adventurous, reheat over a campfire in a cast-iron Dutch oven.
This recipe originally appeared on EdibleLongIsland.com: Winter Walk Along the Great South Bay.