M.A. Kitchen
Step 1: Heat a comal or skillet over medium heat until smoky, then roast tomatillos for 10 mins, flipping occasionally, until soft and charred.
Step 2: Halfway, add onions and garlic; roast till onions are translucent.
Step 3: Briefly roast chilies.
Step 4: Blend peeled garlic, chilies, onions, half tomatillos, 1 tsp salt, ½ cup water till smooth.
Step 5: Add remaining tomatillos, pulse, adjust salt, transfer to bowl or jar.