In a large bowl, combine cold water, sliced lemon, fresh ginger, and kosher salt.
Add the chicken wings to the lemon ginger brine and let them soak for 30 minutes.
Remove the wings from the brine and pat them very dry with paper towels.
In a large mixing bowl, toss the wings with baking powder, kosher salt, black pepper, garlic powder, onion powder, paprika, sugar, MSG, and avocado oil until evenly coated.
Heat peanut oil or canola oil in a deep fryer to 350°F.
Fry the wings in batches for 8–10 minutes, or until lightly golden and cooked through.
Transfer the wings to a wire rack and let them rest for 5–10 minutes.
Increase the oil temperature to 375°F.
Fry the wings a second time for 2–3 minutes, or until extra crispy and deeply golden.
Transfer the wings back to a wire rack while you prepare the toss.
In a large skillet, heat avocado oil over medium heat.
Add the minced garlic, jalapeño, and serrano pepper. Cook for 1–2 minutes, stirring often, until fragrant.
Stir in the kosher salt, coarse black pepper, sugar, and MSG.
Add the double-fried wings to a large bowl and pour the garlic pepper mixture over the top.
Toss until the wings are evenly coated.
Garnish with sliced green onions and serve hot.