Blue:

• Cut 1/4 head of red cabbage into chunks and add to 4 cups boiling water.
• Stir in 2 Tbsp. vinegar.
• Let cool to room temperature and remove cabbage with a slotted spoon.

Photo Source: Alejandrawoodleywonderworks

Learn how to make green with this awesome onion trick…. Page (3) tells you how. 

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