How to Make It
In a large bowl, combine the buttermilk with 2 1/2 teaspoons of kosher salt. Add the rabbit pieces and turn to coat. Let stand at room temperature for 1 hour.
Set a wire rack over a baking sheet. In a large, resealable plastic bag, mix the flour with the cornmeal, dried sage, cayenne pepper and 1 teaspoon of kosher salt. Shake to blend. Remove the rabbit from the buttermilk, letting the excess drip back into the bowl, then add the rabbit to the cornmeal mixture in the bag; shake to coat thoroughly. Transfer the coated rabbit pieces to the wire rack.
In a large saucepan, combine the canola and olive oils and heat to 365°. Add the coated rabbit pieces and fry, keeping the heat steady and turning once, until deeply golden on the outside and white throughout, 8 to 10 minutes. Transfer the rabbit pieces to paper towels to drain and sprinkle with coarse sea salt. Let them stand for 5 minutes before serving.