Divide the oil among the cups of a 6-cup muffin pan. Place the pan in the oven until the oil is very hot, about 5 minutes.
In a blender, combine the flour, milk, eggs, garlic and peppercorn marinade seasoning and salt. Transfer the batter to a measuring cup to make it easier to pour into the muffin cups.
Carefully, as the oil may pop or splatter, pour the batter about 1/3 the way up the sides of the muffin cups. Place in the oven and bake for 15 minutes. Refrain from opening the oven door or they will not rise properly. The popovers are done when they have more than tripled in size and are golden brown and crisp around the edges. Serve immediately.