Preheat the oven to 450°F. Shuck, leaving on the half shell:
Process in a food processor just until minced:
Add:
Process for 10 seconds more. Cover a baking sheet with:
Nestle the oysters in their half shells in the salt. Spoon 1 heaping teaspoon of the spinach mixture over each oyster. Bake until plumped, about 10 minutes. Turn the oven to broil to brown the tops, 2 minutes more.