The Mûre Tilquin à l’ancienne is a spontaneous fermentation beer obtained from the fermentation of fresh or frozen blackberries in young lambics, blended with 1, 2 and 3 years lambic to reach a final concentration of fruits of 300-350 gr fruit per liter. The wort for the lambic comes from Boon, Lindemans, Girardin and Cantillon.