This wonderful fried green beans with sweet hot mustard dish can be found in Jimmy Bradley's "The Red Cat Cookbook."
Place Dijon mustard, dry mustard, hot sauce, soy sauce, and honey in a small saucepan over low heat. Whisk until ingredients are well incorporated and sauce is warm, about 5 minutes. Transfer to a small bowl; set aside to cool.
Line a plate with paper towels and set aside. Place oil in a large pot so that it reaches a depth of 4 inches. Heat over medium-high heat until oil reaches 350 degrees on a deep-fry thermometer.
Meanwhile, in a large bowl, whisk egg whites together until soft peaks form. Whisk in flour and club soda. Working in small batches, dip beans into batter, letting any excess drip off. Carefully lower beans into oil. Cook, stirring periodically to keep beans from sticking together, until light golden brown, about 3 minutes. Remove beans from oil using a slotted spoon and transfer to the paper towel-lined plate; season with salt.
Let oil return to 350 degrees on the deep-fry thermometer and repeat process until all beans have been fried.
Serve beans immediately with mustard sauce.