Slice onions into 1/2-inch (1-and-1/4-centimeter) slices and separate the rings. Place in a large bowl filled with water and ice cubes. Set aside for 30 minutes. (This removes the sharp taste.)

Line two non-disposable baking sheets with Gefen Parchment Paper. Pour oil lightly over each sheet, but don’t overdo it.

Preheat oven to 450 degrees Fahrenheit (230 degrees Celsius).

Prepare a large flat plate with 1/2 cup flour. Place remaining one cup flour and all the spices, aside from the regular salt, in a large bowl. Stir to combine. Add the beer and mix to make a smooth batter. Prepare another plate with panko crumbs and regular salt, and mix together.

Working with one onion ring at a time, remove the rings from the water and dredge in flour until well coated. Dip in the batter, allowing excess batter to drip back into the bowl, and then into the panko crumbs to gently coat. Set aside until ready to bake.

Heat trays with oil in the oven until the oil is very hot. Carefully place the battered onion rings in the oil, taking care not to overcrowd them.

Return the trays to the oven and bake for eight minutes; flip over and bake an additional eight minutes. Drain on paper towels.

Serve warm with ketchup on the side, if desired.