Phase 1 (3 weeks):

1. Pour the 190 proof grain alcohol into a 1/2 gallon jar with a lid.
2. Add all the fresh blackberries to the jar.
3. Crush the blackberries using a wooden spoon.
4. Seal the jar tightly with the lid and let it sit for 3 weeks.
5. Shake the jar every other day to mix the ingredients evenly.

Phase 2 (2 weeks):

1. Prepare the simple syrup by bringing 4 cups of water to a boil in a saucepan.
2. Add 3 cups of sugar to the boiling water and stir until the sugar dissolves completely.
3. Let the simple syrup mixture cool to room temperature.
4. While the simple syrup mixture is cooling, strain out the remaining blackberries from the alcohol mixture.
5. Return the alcohol mixture to its jar.
6. Pour the cooled simple syrup mixture into the jar with the alcohol.
7. Seal the jar tightly with the lid and let it sit for 2 weeks or longer.

The resulting moonshine will be strong at 95 proof with a delightful blackberry flavor. Enjoy responsibly!