In a small jar, shake together the lemon juice and maple syrup.
Put the jar under the spout of the juicer and juice the ginger and turmeric into the jar. Screw on the top, making sure it's firmly in place (so the juice doesn't fly out and stain your kitchen) and shake to incorporated all the ingredients.
Pour about 1 1/2 tablespoons of the turmeric juice mixture into a short glass. Fill halfway, or further, with sparkling water and stir. If desired, add a few ice cubes, then top with fresh black pepper.