When evaluating sushi ginger, prioritize texture, color, and brine composition. High-quality ginger should be crisp and tender without being fibrous or woody. For Pink Ginger, ensure the color is uniform and achieved through natural pigments like perilla or beet juice rather than artificial dyes if your market has strict additive regulations. For White/Natural Ginger, look for a pale, creamy hue. The brine should have a balanced acidity (pH 3.0-3.5) and a clear appearance, indicating proper fermentation and preservation.