In the first, combine the flour, smoked paprika, and 1/4 teaspoon salt. Mix well. In the second, add the egg and water and lightly beat together. In the third, stir together the panko and the remaining 1/4 teaspoon salt. To bread the onion rings: 1) dredge them first in the flour mixture, shaking off any excess.
In a one bowl, add the almond flour, salt, and pepper. In another bowl, add the keto bread crumbs and in a third bowl, add the eggs and whisk together. Get one onion and dip in the egg mixture, followed by the almond flour mixture, then the egg mixture again, and finally in the keto bread crumbs. Shake off excess coating and set aside.
Dip each onion ring into the batter, letting the excess drip off. Then, add a few onion rings at a time to a large saucepan with hot oil. Fry for 4 to 5 minutes until golden brown. Remove the onion rings with a slotted spoon and place them on a plate lined with paper towel. Repeat until all onion rings are fried. Preheat the oil in a dutch oven or cast-iron skillet to 350 degrees F. When the oil is hot, take a handful of the onion rings and dredge them in the flour mixture. Shake off any excess flour and add to the hot oil. Fry for one to two minutes or until they are golden brown.