How to Make It
Stir together almond flour, chili powder, and salt in a medium bowl. Beat egg in a separate bowl. Dip fish in egg, letting excess drip off. Dredge in almond flour mixture, pressing to adhere. Transfer to a plate.
Heat ½ inch of oil in a large nonstick skillet over medium-high. Cook fish, turning once, until browned and cooked through, about 3 minutes per side.
Stir together mayonnaise and relish. Serve fish with mayonnaise mixture and lemons.