I admit you don't have to make your own butter. I don't...well I didn't until now. I'm pretty sure I won't be doing this often considering whip cream is kind of expensive. But it was pretty fun to make. I salted the butter after I strained it. I over salted it so my butter came out salty, but overall it was tasty.
You will need
1 container of cream
1 tsp salt
1) In a cold bowl add the cream and whip until the cream separates into curdled butter and milk. The leftover liquid is buttermilk.
2) Drain the butter from the buttermilk.
3) Using a spatula fold the butter until smooth
4) Add salt and fold a few more times to combine.