Cook penne in boiling salted water.
In a large frying pan heat bacon until fat begins to melt. Stir
peas and saute for 1 to 2 minutes before adding shrimp. Cook until
done. Remove from heat and stir in butter until melted.
In a bowl combine ricotta, salt, pepper and Parmesan. Just before
serving, add 1 or 2 tablespoons boiling pasta water and whisk
Drain penne when al dente and mix in ricotta. Add bacon, shrimp
and toss together before serving.