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1
Preheat the oven to 200 degrees F (93 degrees C).
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2
Season pork belly with salt, pepper, and cayenne. Place fat-side down on a piece of parchment paper; fold paper around pork, then wrap in a few layers of foil. Place in a baking dish, fat-side up.
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3
Bake in the preheated oven until internal temperature reaches 165 degrees F (74 degrees C), about 7 1/2 hours. Let cool completely, still wrapped, then transfer to the refrigerator.
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4
Drain the soaked black-eyed peas and place in a pot with 2 quarts water. Bring to a simmer over high heat. Add bay leaf and salt. Reduce heat to medium-low and cook until beans are just tender, 35 to 40 minutes. Drain beans and set aside.
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5
Whisk Dijon mustard, white vinegar, rice vinegar, and oil together in a bowl. Add garlic, onion, jalapeno, and bell pepper. Pour warm beans into the dressing. Season with salt, pepper, and cayenne; toss to combine. Wrap salad in plastic wrap and chill to let flavors blend, 8 hours to overnight.
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6
Mix parsley into the salad and taste for seasoning.
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7
Unwrap pork belly; cut into bite-sized chunks. Transfer pieces into a dry pan over medium heat. Cook, stirring occasionally, until lightly browned and crispy, 5 to 10 minutes.
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8
Place salad in serving bowls and top with pork belly.