Set oven to 245. Put your cannabis in your mason jar and bake for 90 minutes. Let cool for 3 hours and then pour in your butter and put it in a pressure cooker for another 90 minutes to infuse the oil or butter. Alternatively you can stir it in a slow cooker if you have no pressure cooker but you will lose terps. This works for Sunflower oil, Butter, or Coconut oil,.