Add nuts to food processor. Pulse until they are in pieces. Add the dates and dried blueberries, and process until they are in tiny pieces and starting to stick together
Add the lemon juice, vanilla extract, and salt. Blend everything until it forms a big sticky ball.
Use a teaspoon or tablespoon scoop to form balls. You might need to stir the mix as you go, as the lemon juice tends to lurk at the bottom. Use your hands to compress each ball. Store in a sealed container in the fridge for up to two weeks, or freeze between layers of wax paper.
OM NOM NOM!