"This 5-ingredient batter is light as air...."
Vegetable oil
medium red bell pepper, cut into 1/2" wide strips
medium yellow onion, cut into 1/2" rings
medium head broccoli, cut into florets
all-purpose flour
cornstarch
kosher salt, plus more for serving
large egg, whisked
chilled light beer or seltzer water
mayonnaise
hot sauce
garlic clove, grated