Low and slow. Start with a large pot on the stove add about a half inch of water and bring to a simmer. Cut up the fat into 1” x 1” pieces and add to the pot. You want to stay in the low 200 degree range. It’s about a four to five hour process. Add about two cups of fat at a time stirring periodically. Your tallow will be a gold color when done. I poor through a fine mesh wire basket with a large coffee filter. No need to strain any further. Poor into a resealable container. The color will change to a creamy white at room temperature. You can freeze or go to the refrigerator.

Could you put it in a pot in the smoker while smoking a brisket?

I wrap mine in foil and render it while I`m smoking my brisket.