1. In a deep skillet or soup pot over medium-high heat, brown the ground beef until no longer pink. Drain the fat (do not wipe pan) and set beef aside.
<1a. Entertain the baby with something exciting like banging on metal bowls with a big wooden spoon (or chewing on the spoon which is apparently way more exciting to a teething baby).>
2. In the same pan you cooked the beef, melt the butter over medium heat. Add onion and saute for 2-3 minutes until slightly softened.
6. Drain the pasta and gently fold into the sauce mixture. Serve immediately and/or freeze as desired.