In a deep frying pan, add 1-1.5 inches of vegetable oil. Fix a candy thermometer to the edge (in the oil but not touching the bottom of the pan) and set heat to medium. Oil needs to reach 375°F before frying.
Lay tomato slices in a single layer on double layered paper towel and pat dry. Let rest while mixing ingredients. This will remove excess moisture and will help the flour mixture stay on when frying.
In a shallow dish (like a pie dish), add ½ cup flour.
On a second dish, mix together remaining ½ cup flour, cornmeal, Cajun seasoning, and pepper until blended.
In a third shallow dish, whisk together eggs, buttermilk and hot sauce.
In batches of 4 (in order to keep egg mixture from seeping into cornmeal/flour mixture), dredge tomato slices first in the plain flour, then into egg wash then finally into seasoned flour-cornmeal coating. Gently press breading onto tomato slices.
When oil is to temperature, fry 4 slices to avoid over crowding the pan.
Fry for 2-2.5 minutes per side, gently turning with tongs until golden.
Remove from oil using tongs and place on a paper towel lined platter to remove excess oil. Do not stack. Season with salt. Enjoy.