Make Spicy Mayo
Whisk all ingredients. Chill.
Prepare Onion
Cut off the top of the onion. Peel.
Cut onion from root into ¼, then ⅛, then 1/12 sections.
Spread layers to resemble a flower.
Make Dredge
Whisk eggs, 1 Tbsp garlic powder, jalapeno powder, and 2 tsp salt. Whisk in milk and buttermilk.
Whisk flour, corn starch, remaining 1 Tbsp garlic powder, paprika, chipotle powder, coriander, and remaining 2.5 tsp salt.
Fry Onion
Coat onion in flour dredge.
Dip in wet mixture to coat.
Coat again in flour dredge.
Fry in 375℉ (190℃) oil for 3-5 minutes.
Drain on paper towels. Season with salt.
Serve with spicy mayo.
