Zacatecas-Style Green Mole With Chicken (Pollo en Mole Verde Zacatecano)

Ingredients

• 1 (3–4-lb.) whole chicken, cut into 8 pieces
• 1⁄2 cup chopped cilantro stems
• 2 tbsp. kosher salt
• 1 tsp. whole black peppercorns
• 2 cloves garlic
• 1 large yellow onion, chopped
• 1 bay leaf
• 8 oz. tomatillos, peeled and chopped
• 2 jalapeños, stemmed and chopped
• 1⁄2 cup cilantro leaves
• 2 tsp. kosher salt, plus more to taste
• 2 cloves garlic, chopped
• 2 (8-inch) flour tortillas, toasted, plus more for serving
• 3 tbsp. canola oil
• Mexican rice, for serving