Yes, grated beetroot can be prepped and stored without significant color bleeding by immediately mixing it with an acid like lemon juice or vinegar and storing it in an airtight container in the refrigerator.
Beetroot's vibrant color comes from betalain pigments, which are water-soluble and prone to leaching out when the beetroot is grated or cut. This is what causes the color bleeding. To minimize this, you need to stabilize the pigments. Here's a step-by-step guide:
Grate the Beetroot: Wash and peel the beetroot. Then, grate it using a box grater or food processor.
Add an Acid: Immediately after grating, mix the beetroot with an acid. Lemon juice, vinegar (white, apple cider, or balsamic), or even a small amount of citric acid work well. Use about 1-2 tablespoons of acid per medium-sized beetroot. The acid helps to stabilize the betalain pigments, reducing color loss.
Mix Thoroughly: Ensure the acid is evenly distributed throughout the grated beetroot.
Store Properly: Transfer the beetroot to an airtight container. Press down gently to remove excess air. Store in the refrigerator.
Use Within a Few Days: While the acid helps preserve the color and freshness, it's best to use the grated beetroot within 2-3 days for optimal quality.
Wear gloves when handling beetroot to prevent staining your hands. Also, use a dedicated cutting board that you don't mind getting stained, or line your cutting board with parchment paper for easy cleanup.