(Based on a Hungry Girl recipe.)
Add broccoli slaw and water to a small saucepan in a 4:1 cup ratio (e.g. 1 cup of slaw [about a quarter packet], 1/4 cup of water). Bring to a simmer, stirring occasionally, until all the water has evaporated and the slaw is tender (about 6mins). Mix in a few spoonfuls of marinara sauce, and (optional) warm cooked sausage.
For quick, mess-free sausage: Slice pre-cooked sausage links on the diagonal and lay on a lightly greased tray. Bake at 400F for around 12mins, flipping halfway.
Verdict: Immensely satisfying.
Update: I tried to make a one-pot “spag” bol with this, adding the slaw to browned ground turkey and red sauce. It worked fine, but the slaw takes much longer to simmer and soften (nearly 30 minutes!) in the sauce than in water.