You can substitute almond butter, cashew butter, or any nut butter for a great kefir ice cream. I use stevia in place of sugar in the recipe. Nuts and legumes are prebiotics, which is food for your bacteria to make it grow and multiply. These are considered some of the most satiating foods. Studies have found that people who eat nuts (tree nuts like cashews, almonds and pistachios, along with their legume pal, the peanut) live longer and healthier lives, with less risk of chronic ailments like heart disease, respiratory problems and Type 2 diabetes.
I use stevia. I like to use different versions together - such as a liquid and powdered version of stevia. When used together, they seem to work better. For a regular sweetener, you can use honey, Sucanat, or coconut sugar. Add more or less than 1/4 cup depending on how sweet you like it. Taste it as you are adding the sweetener to see if you need to add more or less.