Sardinia — the myrtle scrubland (macchia mediterranea) covers vast areas of the island. The tradition of macerating wild berries in alcohol for digestivo liqueurs is ancient in Sardinia and the island's mirto is widely considered the benchmark expression of this berry.
Mirto (myrtle liqueur) is the defining digestivo of Sardinia: a liqueur macerated from fresh myrtle berries (Myrtus communis) gathered from the wild macchia scrubland that covers much of the island. The berries are steeped in neutral alcohol for 30-60 days, then sweetened and bottled. The result is a deep purple-black (from the berries' anthocyanins), intensely aromatic, and bittersweet — with a flavour of dark berries, resin, wild herbs, and a slight camphor note from the myrtle oils. It is served very cold, almost at freezing point, after meals.
Cold mirto presents as a rush of dark berry sweetness, followed by the resinous, slightly camphor note of the myrtle oils, then a long, bittersweet finish. The anthocyanins from the berries give a colour that stains the glass. The flavour is simultaneously fruity and herbal — like a digestivo designed for a place where the food just made demands something wild and aromatic to close.
The quality of mirto depends entirely on the berries: fully ripe myrtle berries (harvested October-November when they are blue-black and slightly soft) provide the deepest colour and richest flavour. Under-ripe berries produce a more bitter, less complex product. Maceration ratio: 200-300g berries per litre of 95% neutral alcohol, steeped for 30-45 days in a sealed jar at room temperature, turning daily. Strain and press the berries to extract maximum colour and flavour. Sweeten with simple syrup (1:1 sugar-water) to taste (typically 200-250g sugar per litre of strained infusion). Dilute to 30-35% ABV with water. Bottle and rest minimum 2 weeks before drinking.
Store the finished mirto in the freezer — it won't freeze because of the alcohol content, and serving temperature of -5 to -10°C is the classic presentation. The berries after maceration can be dried and used to flavour game braises or a second, shorter maceration. White mirto (made from the white-berried variety) is less common and more delicate — a different product.
Harvesting berries before fully ripe — insufficient colour and flavour, excessive bitterness. Too short a maceration — the essential oils and anthocyanins haven't fully extracted. Over-sweetening — mirto should be bittersweet, not cloying. Serving at room temperature — the flavour is designed to be experienced cold, almost icy.
Slow Food Editore, Sardegna in Cucina; Giorgio Locatelli, Made in Italy