Place pork belly skin side up on a cutting board, and cut into 1-inch pieces.
In a large Dutch oven, place lard and pork belly. Do not layer pork belly in more than 3 layers. Bring to a boil over medium-high heat, stirring frequently; reduce heat to medium, and cook, stirring frequently, until skin blisters and turns golden brown. Transfer pork belly to rimmed baking sheets, and refrigerate until cold.*
In a large Dutch oven, pour oil to a depth of 4 inches, and heat over medium-high heat until a deep-fry thermometer registers 380˚. Add pork belly in batches, and fry until puffed and golden brown, about 2 minutes. Let drain on paper towels, and liberally sprinkle or toss with Cracklin' Spice.
Notes
*Set aside lard; once slightly cooled, strain and reserve for another use.
Recipe by Louisiana Cookin' at https://louisianacookin.com/isaac-toups-cooks-cracklin/