Step 1

Preheat the oven to 350°. Slice off approximately 1 inch of the pointed top of each garlic head so that the cloves are slightly exposed. Place the heads on a sheet of foil and drizzle with olive oil. Season with salt and pepper. Tightly wrap the garlic in the foil. Place on a rimmed baking sheet and roast until the garlic is very tender and soft, 35 to 40 minutes.

Step 2

Squeeze out 1/4 cup of the roasted garlic cloves (reserve the rest for another use). Mash thoroughly.

Step 3

Combine the mashed garlic with the mayonnaise, mustard, Worcestershire sauce, 1/4 teaspoon salt and pepper to taste in a medium bowl. Mix thoroughly. Refrigerate until ready to use.