Puree cilantro stems (only), tomatoes, jalapeño

Heat puree in sauce pan over medium high heat, stirring occasionally, until reduced by half. About 10 minutes

Stir chicken into pan. Let simmer.

Drain black beans. Heat over medium low heat in small skillet. Mash when tender.

Season chicken and beans with salt and pepper to taste.

Assemble tacos. Top with squeezed lime juice, chopped cilantro leaves and sour cream

Enjoy:)