Vinegary Chicken With Raisins

Name: Vinegary Chicken With Raisins
Ingredients: 3 lb. skin-on, bone-in chicken thighs (6–8); Kosher salt; 1 Tbsp. vegetable oil; Extra-virgin olive oil (optional); 1 large shallot, thinly sliced; 3 garlic cloves, finely chopped; ½ cup raisins, preferably golden or green; Freshly ground pepper; 2 Tbsp. (or more) sherry vinegar or red wine vinegar; 1 Tbsp. unsalted butter; 5 oz. baby arugula or mixed tender greens (about 6 cups); Country-style bread (for serving; optional)