In small bowl, stir broth, flour, curry paste and remaining 1/2 teaspoon salt; stir into mushroom mixture. Cook 5 minutes, stirring constantly, until thickened. Stir in shrimp. Cook 5 minutes longer or until shrimp are pink. To serve, spoon shrimp mixture into 8 (10-oz) custard cups. Top each with 2 sesame wontons.