Cook penne as package directs. Meanwhile, in a medium covered saucepan, bring peas, broth, pepper, and salt to a boil over high heat. If needed, cook further just until tender. Purée half of pea mixture in a blender until smooth. Pour both pea mixtures over drained pasta in pasta pan. Stir in tarragon. Spoon into bowls. To each, add 1/4 cup ricotta in small spoonfuls and mix gently.
Note: Nutritional analysis is per serving.