Heat neutral oil to 350 degrees Fahrenheit. Fry the Brussels sprouts in batches. Do not overcrowd the fryer. Overcrowding drops the oil temperature and leads to greasy sprouts instead of crisp ones.
Fry until deeply golden and shatter crisp on the outside. The centers should be tender and fluffy. Transfer to a bowl while hot.
In a heatproof bowl, combine brown sugar, paprika, cayenne, garlic powder, onion powder, kosher salt, and black pepper. Carefully pour in the hot frying oil and whisk until smooth. Add about 1 tablespoon of Frank’s RedHot, then taste. Add more if you like extra heat.
Immediately toss the hot Brussels sprouts in the sauce until evenly coated.
In a bowl, mix mayonnaise, Dijon mustard, lemon juice, lemon zest, microplaned garlic, celery, dill, and salt.
Swoosh the remoulade onto the bottom of a bowl. Finish with crumbled blue cheese and fresh dill.