Preheat the oven to 400°F (200°C).
Bring a large pot of salted water to a boil. Add 1 tablespoon baking soda to the boiling water.
Add the potato wedges to the boiling water and parboil for 7–10 minutes, until the exterior is tender but the centers are still firm when pierced with a fork.
Use a slotted spoon to transfer the wedges to a baking sheet and let them cool briefly. Shake the pan gently to rough up the cut surfaces without breaking the wedges.
Drizzle the wedges with 3 tablespoons avocado oil, turning to coat both sides. Spread them in a single layer on the baking sheet.
Bake for 40 minutes, flipping once halfway through, until the wedges are golden brown and crispy.
Season with sea salt to taste and serve immediately.