Prepare the onions: Cut onions in half vertically, then slice horizontally into very thin slices. If using regular onions (not fresh), soak the slices in cold water for 5-10 minutes, then drain well.
50 g fresh onions
Mix the ingredients: In a glass jar or container, combine sliced onions, sliced cooked beets, apple cider vinegar, and salt.
20 g cooked beets, 2 tsps apple cider vinegar, 1 pinch natural salt
Marinate❶: Let sit at room temperature for at least 30 minutes, stirring occasionally.
Adjust sweetness: Taste the liquid. If it’s not sweet enough, add sugar gradually (starting with ½ teaspoon) and adjust to taste.
sugar
Marinate❷: Cover and refrigerate overnight.
Store: Keep refrigerated in an airtight container. Best consumed within 5 days.
Notes
Use fresh onions (新玉ねぎ) for best results – naturally mild and sweet
Choose beets with deep red-purple color for natural sweetness and vibrant pink color
Sugar amount varies by beet sweetness – taste and adjust
Overnight marination significantly improves flavor and color