Pork and Chickpea Stew With Cinnamon

Name: Pork and Chickpea Stew With Cinnamon
Ingredients: 3 lb. boneless pork shoulder (Boston butt), fat cap trimmed if needed, cut into 4 pieces; 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt, plus more; Freshly ground pepper; 2 Tbsp. extra-virgin olive oil; 4 3 cinnamon sticks; 1 medium red onion, coarsely chopped, plus thinly sliced for serving; 4 garlic cloves, smashed; 3 Medjool dates, pitted, chopped; 1 large bay leaf; ¼ tsp. cayenne pepper; 1 28-oz. can whole peeled tomatoes; 2 15-oz. cans chickpeas, rinsed; 1 Tbsp. (or more) red wine vinegar; Torn mint leaves (for serving)