Place half the milk kefir into the Thermomix bowl with the sugar, salt and vanilla.
Blend 2 min/speed 10 or until the sugar has dissolved.
Add the remaining milk kefir and sour cream and blend 10 sec/speed 10. Pour into an ice cream churner and churn until frozen.
To make it Lemon, which really suits the sour notes of the kefir, mill the lemon zest with the sugar before you begin. Add the lemon oil with the second amount of milk kefir. Proceed with freezing as instructed.
To make it Chocolate melt the chocolate before you begin making the remainder of the recipe. Mix the cocoa with some hot water until smooth. Add both during the first blending.
To make it Burnt Honey cook the honey without stirring in a large flat frying pan on a medium heat until just smoking and smelling toasty. Quickly add it to the Thermomix bowl and proceed with the recipe, WITHOUT using any sugar. Toasted macadamias are a great addition to this one, stir through prior to churning or after the blending if using the Thermomix method.
To make it Raspberry Ripple, make the entire recipe and add the cold coulis to the churner when it is almost frozen. If you are using the Thermomix blend method below, (no churner) then drizzle the coulis through the hold in lid, right at the end. (See below.)
NO CHURNER: Thermomix Method If you don't have a churner yet, freeze this mix in an ice cube tray, and when frozen, blend in your Thermomix for up to 1 min/speed 10 with the aid of your Thermomix spatula. (Add the coulis at the end and don't over mix.)