Combine the balsamic vinegar, apple syrup, and juice from half an untreated orange in a saucepan. Bring to a boil over medium heat, then reduce heat to low. Stir constantly and simmer for 5 minutes until the mixture becomes syrupy.
While the syrup cools, wash the strawberries, pat them dry, and clean them. Cut them in half or into quarters depending on their size.
Once the syrup has cooled for 2 minutes, gently pour it over the strawberries and mix gently.
Garnish with wafer-thin orange peel slices and fresh mint or lemon balm leaves.