Hot Crab and Artichoke Dip

Name: Hot Crab and Artichoke Dip
Ingredients: 1 (9-ounce) package frozen artichoke hearts; 1 red bell pepper, finely chopped; 3 tablespoons unsalted butter; 2 tablespoons all-purpose flour; 1 1/4 cups half-and-half; 3 scallions, thinly sliced; 2 ounces finely grated parmesan (1/2 cup); 1 1/2 teaspoons fresh lemon juice, or to taste; 1 1/2 tablespoons minced drained pickled jalapeño chiles; 1/2 teaspoon salt; 1/4 teaspoon celery salt; 3/4 pound jumbo lump crabmeat, picked over; Accompaniment: benne seed pita toasts