Cook macaroni according to package directions. Drain, rinse briefly under cold water to prevent sticking, and set aside.
In a large, deep skillet, brown meat. When meat is halfway done, add onion and continue to cook until onion is soft and transparent. Drain off fat. Stir in remaining ingredients, except for peas. Bring to a boil, reduce heat to lowest setting, and simmer, covered, over low heat for 15 minutes.
Stir in peas and cooked macaroni, and simmer for 15 minutes more.
Add any of your own ideas for seasonings to this, such as chopped basil or dried oregano flakes, minced garlic, etc.