Created by HoneyBell on November 6, 2013
Step 1: Put oven rack in middle position and preheat oven to 400°F.
Step 2: Cut off and discard top fourth of garlic head. Drizzle exposed garlic with oil and sprinkle with 1/4 teaspoon salt, then wrap head tightly in foil. Roast garlic until tender, about 1 1/4 hours, then open foil and cool.
Step 3: While garlic roasts, simmer cream in a 1 1/2- to 2-quart heavy saucepan, stirring occasionally, until reduced to about 3/4 cup, 20 to 25 minutes, then transfer to a bowl.
Step 4: Squeeze garlic into a small bowl, discarding skins, and mash together with horseradish, pepper, and remaining 1/2 teaspoon salt using a fork.
Step 5: Stir garlic mixture into cream.
Step 6: Refrigerate until ready to use.