Spiral Foods Red Wine Vinegar is commonly used in Mediterranean countries and is a staple in French and Spanish homes. Red wine vinegar is made by allowing the wine to ferment until it sours, producing acetic acid. Once fermentation is completed, the vinegar is strained and allowed to age in wooden barrels and the longer the vinegar ages, the more mellow the flavour becomes. Red Wine Vinegar a rich, vibrant colour and flavour, adding a robust taste to your favourite salad dressing, glaze or marinade.