Step 1

Place fresh turmeric in a food processor along with powdered turmeric. Add ginger, shallot, garlic, brown sugar, ancho chili powder, coriander, chipotle, cayenne, rice vinegar, soy sauce, fish sauce, tamarind paste, and cilantro. Blend into a fine paste.

Step 2

Cut pork into 1 1/2-inch cubes, trimming off fat as needed. Place pork in a bowl; season with salt. Pour in the marinade. Mix and massage pork with your hands until completely coated. Cover with plastic wrap and refrigerate for 4 to 18 hours.

Step 3

Preheat an outdoor grill for medium-high heat and lightly oil the grate. Thread pork through skewers so the pieces are touching but not squished together. Reserve leftover marinade.

Step 4

Grill skewers, brushing on reserved marinade, until pork just starts to firm up but is still slightly pink in the center, about 10 minutes per side. An instant-read thermometer inserted into the center should read 145 degrees F (63 degrees C). Serve immediately.