1In a large mixing bowl, whisk together the flour and eggs.
Gradually add in the milk and water, stirring to combine.
Add the salt and melted butter; beat until smooth.
Heat a lightly oiled griddle or frying pan over medium-high heat.
Pour or scoop the batter onto the griddle, using approximately 1/4 cup for each crepe.
Tilt the pan with a circular motion so that the batter coats the surface evenly.
Cook the crepe for about 2 minutes, until the bottom is light brown.
Loosen with a spatula, turn and cook the other side.
Place a spoonful of blackberry jam in the center of each crepe.
Fold the crepe over the jam and serve warm.