Using lemon water for blanching potatoes intended for French fries can be effective in preventing oxidation and maintaining color. Here’s a step-by-step guide to incorporate lemon water in the blanching process:

1. Cutting and Soaking:
• Cut the potatoes into French fry shapes.
• Soak the cut potatoes in a lemon water solution (approximately 1/4 cup of lemon juice per liter of water) for about 15-30 minutes. This helps in preventing initial browning.
2. Blanching Preparation:
• Prepare a pot of boiling water. Add lemon juice to this water to maintain the acidity, which helps in preventing browning during the blanching process. Use a similar ratio as in the soaking solution (1/4 cup of lemon juice per liter of water).
3. Blanching Process:
• Add the soaked potatoes to the boiling lemon water and blanch them for 3-5 minutes. Blanching time can vary based on the thickness of the fries. The goal is to par-cook them without fully cooking them.
• Ensure the water returns to a boil quickly after adding the potatoes.
4. Cooling:
• After blanching, immediately transfer the potatoes to an ice water bath to stop the cooking process. This step is crucial to maintain the texture and prevent overcooking.
5. Draining and Drying:
• Drain the potatoes thoroughly after cooling. Pat them dry with a clean towel or use a salad spinner to remove excess moisture. This helps prevent ice crystals from forming during freezing.
6. Pre-Freezing:
• Spread the blanched and dried potato fries in a single layer on a baking sheet lined with parchment paper. Ensure they are not touching each other.
• Freeze them for a couple of hours until they are solid.
7. Final Freezing (IQF Technology):
• Transfer the pre-frozen potato fries into airtight freezer bags or containers. Seal them tightly to prevent exposure to air.
• Use IQF (Individually Quick Frozen) technology if available. This involves rapidly freezing the fries using very cold air, which helps in maintaining the quality, texture, and color of the fries.

By blanching the potatoes in lemon water, you can further ensure that the fries maintain their color and quality during freezing. This method leverages the acidity of lemon juice to prevent oxidation and enhance the overall appearance of the French fries.