Set aside the chicken and stock. In a blender or food processor, purée the tomatoes, tomatillos, red bell pepper, onions, garlic, epazote, dissolved masa harina, and the reserved onion and parsley.

Herbs are an easy and highly personal way to add textures and aromatic flavors to a dish. But whether they’re as popular as chives or as divisive as cilantro, few can claim to be as unique and ...