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Wash and dry produce. Grate potatoes on the largest holes of a box grater. Peel and halve onion; grate on the largest holes of a box grater until you have ΒΌ cup; mince remaining onion half until you have 2 TBSP. Finely dice tomato. Quarter lime. Place potatoes and grated onion in the center of a clean kitchen towel; gather into a tight bundle and wring over the sink to remove as much excess moisture as possible.