Preheat the grill
. In a saucepan
, combine the olive oil, peppers, crushed red pepper, salt, and black pepper. Bring the liquid up to a boil and reduce the heat. Simmer the sauce for 4 minutes and remove from the heat. Stir in the garlic. With a hand held mixer
, puree the sauce until smooth. (Alternatively, allow the mixture to cool slightly then transfer to a blender
and puree until smooth.) Stir in the cilantro and kosher salt. At this point, allow the sauce to sit for 1 week under refrigeration before serving. Marinate the sliced beef in 1 cup of the piri piri for 3 to 4 hours, under refrigeration.
Remove the beef and make several slits in the beef about 1/4-inch apart, save the excess sauce for basting. Thread the meat through the swizzle sticks. Place the skewers on the grill. Cook for 2 to 3 minutes on each side. Place the remaining piri piri in a saucepan and bring up to a simmer
. Place the skewers on a platter and drizzle
with the piri piri. Garnish
with chopped cilantro and Essence.