In non-stick dutch oven or chicken fryer, heat about 2 inches of oil to 350.
Meanwhile, in large bowl prepare onion ring mix to as thin or thick as you like and add hot sauce to the batter if desired. In small batches gently add green beans to hot oil. They will sink to the bottom so as soon as they're set, about 5 seconds use spatula to gently lift them off the bottom so they can float.
Fry until batter starts to get golden brown. Drain on paper towels and season with salt.