Betteraves marinées are a recipe which dates back to when families in French-speaking parts of Canada would need to preserve food for the winter. The beets are cut up, boiled and put in jars. Then, they are coated in a recently sterilised mix of vinegar, mustard seeds, beet water and sugar, and the jar is quickly closed to ensure air cannot enter or leave the jar. [1] [2] The beets can be preserved this way for years. The betteraves marinées are best eaten cold.