In a dry skillet over medium heat, toast the peppercorns and the fennel seeds until quite fragrant and starting to brown. Remove the spices from the pan and allow them to cool.
Grind the toasted spices together and set aside.
Ground fennel, fennel pollen, and black pepper to season easier porchetta
Deeply score the meat of the pork belly in a diamond pattern. You can score all the way to the skin, but do not cut all the way through.
Sprinkle the meat generously with salt.
Rub the grated garlic into the scored meat.
Apply the ground, toasted spices to the meat. You want a very good coating, but you may not need to use all of it.
Sprinkle on the chili flakes and the fresh herbs.
Rub all the seasoning into the meat, making sure it gets into the scored channels.
Roll the belly up with the skin on the outside so that it makes a long tube. The skin might barely meet at the seam.
Place pieces of butcher’s twine on your board about an inch apart. Pick up the belly roll and place it, seam-side-down, on the twine.
Tie the roll, starting from the edges and moving toward the center. Pull each knot tight to compress the roll.
Once the roll is fully tied, mix 2 Tbsp kosher salt with the baking powder and rub it all into the skin of the pork belly, coating it evenly.
Wrap the belly tightly in plastic wrap and refrigerate overnight or for up to 3 days.