In a large pot, boil ditalini in salted water according to package directions.
2
In another small pan, heat the olive oil and butter over medium heat until the butter is melted. Add the onion and simmer while the pasta is boiling.
3
When the onion is translucent, add the peas (juice and all) and simmer on low.
4
When the pasta is "al dente," drain and return to the large pot. Add in the onion and pea mixture, stir and serve immediately, adding salt or pepper to taste.