Beat egg yolks (use as many as you would like to thicken with)
Add a little sugar to emulsify
Blend in cooled blueberry tea and milk, and add blueberries. Tip: don't use too much liquid if you want a thicker sherbet.
Refrigerate
And add to ice cream machine if using one or use the freezer method (stirring every so often to prevent icicles from forming)