To prepare Tottlers: Boil potatoes in salted water just until tender, 3-5 minutes. Drain well. Refrigerate until cool.
Fry potato cubes in 375°F oil until medium golden brown. Drain.
Combine fried potato cubes, bacon, scallion, rosemary, paprika and garlic in a large bowl.
Mash ½ of the potato mixture with large spoon or blend well with hands, compacting and pressing to make a chunky-mashed mixture that sticks together.
Press portions into 2-inch ring molds (2-inch diameter by about 1-inch high), packing very firmly. Refrigerate until cold. Keep refrigerated until ready to serve.
To prepare Pimento Cheese: Combine all ingredients in a mixer with paddle attachment or stir well in a large bowl.
To prepare guiajillo ketchup: Soak peppers in warm water 20 minutes or until softened. Drain, reserving 1/2 cup water. Discard stems and seeds.
Combine peppers, reserved water and remaining ingredients in a blender. Whirl until smooth. Press through sieve if needed to make very smooth.
To serve: Per order, fry 3 tottlers in 375°F oil until browned. Remove and drain. Spread 2 tablespoons pimento cheese on serving plate. Arrange tottlers on top. Dollop with 1 teaspoon sour cream and a drizzle of guajillo sauce*. Garnish with bacon bits and green onion.
Or, as an option, serve guajillo sauce separately for an addition as desired.