Thinly slice strawberries, and sprinkle with a little bit of salt. Set aside.
Reduce balsamic into a syrup. In a small saucepan, heat balsamic until it just barely comes to a boil. Lower heat to a simmer and let it reduce (stirring occasionally) until it's about ½ the amount you started with. (5-7 minutes, depending on how much you have in your pan).
While you're waiting for the balsamic to reduce, drizzle the bread with olive oil and toast or grill it.
Assemble crostini with a piece of mozzarella, strawberries, a drizzle of the reduced balsamic and fresh mint.
Recipe by Love and Lemons at https://www.loveandlemons.com/strawberry-balsamic-crostini/