Easy Cod with Tomato and Herb Butter

Name: Easy Cod with Tomato and Herb Butter
Ingredients: 2 – 2 1/4 pounds fresh cod fillets, cut into 6–8 oz. portions*; 1 lemon; Kosher salt and fresh ground black pepper; 1 medium shallot, finely chopped; 2 garlic cloves, minced; 1 Tbsp. olive oil, plus extra for drizzling; 1 pint grape or cherry tomatoes; 1/2 cup chicken stock; 1/2 tsp. kosher salt; 1/4 tsp. red pepper flakes; 1/4 tsp. granulated sugar; 4 Tbsp. unsalted butter, sliced; 3 Tbsp. fresh chopped herbs (basil, parsley, chives, cilantro), plus extra for garnish