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1
Pour the coffee into a blender.
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2
Turn on low and increase the speed until a vortex forms in the center.
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3
Sprinkle in the xanthan gum and increase the speed to evenly disperse it.
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4
Reduce the speed to medium and add the flour, egg yolk, salt, and baking soda.
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5
Puree to just combine.
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6
Pour the mixture into a whipped cream canister and charge with one CO2 charge.
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7
Alternatively, if you have a carbonation rig, carbonate the batter to 50 psi.
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8
Fill a medium pot half full of canola or rice bran oil and heat over medium-high heat until it reaches 350F (175C).
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9
Put the flour and onion powder on a plate and mix well.
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10
Dispense the coffee batter from the whipped cream canister into a bowl.
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11
Dredge the onion rings in the onion flour mixture, dip them into the batter, and immediately drop them in the hot oil.
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12
Fry 3 or 4 rings at a time, flipping them once halfway through cooking.
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13
When they are golden brown, remove the rings from the pot with a slotted spoon or skimmer and put on a wire rack set over a baking sheet to drain.
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14
Season lightly with the beef seasoning and serve with a side of smoked ketchup.
