My favorite mentor teacher, Julianna Barker Gylseth, taught me a song and activity for first grade that we do every year. The kids love it. We work on this song in November and right before Thanksgiving, we make butter by putting heavy whipping cream into a mason jar and shake it as we pass it in a circle while singing one verse per student until it gets into a clump (mostly solid). We then have the kids wash hands and take turns buttering their rolls. They sit down and eat them.
We talk about where butter comes from and how it used to be made. The dasher was the wooden thing that was put into the churn to make the butter.