Combine the potato, bread and garlic in a food processor bowl fitted with a metal blade. Pulse a few times to mix. With processor on, slowly add the oil and vinegar, alternating between them until the mixture is smooth. The mixture will be very thick. Using the pulse button on the machine, add the lemon juice and as much sparkling water until desired thickness. (The amount of water can be anywhere from 1 cup to more depending on if you want the sauce to be thick for a dip or more loose for a sauce.)
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