How to Make It
In a large saucepan, heat 1 inch of vegetable oil to 350°. In a medium bowl, whisk the rice flour with the baking powder, baking soda, canola oil, club soda and 1 teaspoon of salt until smooth.
Dip the asparagus in the batter and fry, in batches if necessary, until golden and crisp, about 2 minutes. Drain the asparagus on paper towels and season lightly with salt. Serve at once, with lemon wedges or ponzu sauce.