Add ¾ cup walnuts, ½ cup dates and ¼ cup blueberries to a food processor; process until chopped and combined, 7 to 10 seconds.
Add ¾ cup oats, 2 tablespoons maple syrup and 1 tablespoon lemon juice. Continue processing until a smooth, thick paste forms, 20 to 30 seconds.
Transfer the paste to a small bowl; add 1 teaspoon lemon zest and mix to combine.
With your hands, form and roll the mixture into 18 small balls.
