The blueberry frozen yogurt came out really delicious and refreshing by using fresh blueberries. If your blueberries are not as sweet, then consider adding a little more sugar or honey before churning.
Combine the blueberries, sugar, lemon juice, and salt in a medium saucepan.
Heat on medium heat and stir until all of the sugar is completely dissolved.
Then use a potato masher to mash the blueberries. You can use a food processor for this process if you like fine texture, but I love to have some texture so I use this method.
When you are done, remove from heat and let cool for 20 minutes.
Stir in the yogurt and milk until completely incorporated.
Chill the mixture in the refrigerator for several hours (or overnight) until completely cold.
Process the mixture in your ice cream maker according to manufacturer’s instructions (usually about 25 minutes). Transfer the frozen yogurt to an airtight container and freeze it for several hours before serving.
If you do not have an ice cream maker, then transfer the mixture to a container and put it in a freezer. Stir every few hours (3-4 times) to break up the ice crystals until it’s completely frozen.