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Using a sharp knife, remove the rind and the white pith from the lemons. Place the lemon, turmeric, agave nectar and 1 cup water into a blender, and blend on high until smooth. Place a small strainer or sieve over a bowl and strain the mixture.
Fill a tall glass with ice and pour in 1/4 of the lemon-turmeric mixture. Top off with some soda, taste and add more agave if needed.