Scrub the potato and cut into thin wedges, then toss with half the avocado oil, sea salt, and black pepper.
Place the potato wedges in the air fryer at 400°F for 15-20 minutes until they are crispy and browned.
Pat the cod fillets completely dry with paper towels to ensure the batter adheres properly.
In a shallow bowl, whisk together the arrowroot starch, almond flour, remaining salt, pepper, and light beer until a smooth, thin batter forms.
Lightly coat the fish in the batter, letting any excess drip off before placing it in the air fryer basket.
Spritz the fish with the remaining avocado oil and air fry at 375°F for 10-12 minutes, flipping halfway through, until the coating is crunchy.
Serve the hot fish and chips with a squeeze of fresh lemon and a garnish of chopped parsley.