This can be avoided by adding a small amount of vinegar and lemon juice. These two liquids will maintain the cabbage's acidity. Cooking grapes will wash the color out and there is no remedy for bringing the color back. Walnuts baked in bread can add a soft blue color, which is lovely. To remedy this, roast the walnuts in a 350-degree oven for 10 minutes to stabilize them enough so that they don't change color.
Cherries have the tendency to turn dark blue in muffins.
Two simple solutions to keep the batter acidic, and therefore the cherries red, is to substitute buttermilk for milk and baking soda for baking powder when called for in recipes. For a dash of red that isn't going anywhere, always go with red peppers, which will stay red when cooked. When serving beets, keep the beet slices in oil instead of water. The oil will allow the beets to keep their color longer than water, which will wash them out. 1997 Order this title .