Why can serviceberry liqueurs become bitter after long infusion?

Expanded Explanation

Serviceberry liqueurs can become bitter when prolonged contact allows alcohol to extract increasing amounts of tannin and seed-derived compounds. The flesh and skins initially provide pleasant fruit, colour and gentle structure, but extraction does not stop once the desired flavour is reached. Over time, the balance can shift toward dryness, woody notes and a persistent bitter finish. This is more likely when the berries are heavily crushed, because damaged seeds expose their interior directly to the spirit.

Warm storage, high alcohol strength and frequent vigorous shaking accelerate this process. A jar kept near sunlight or a heat source may extract harsh components much faster than one stored in a cool cupboard. Very underripe fruit can also contribute bitterness because its skins and seeds are more astringent and its sugar content is lower. Cinnamon, citrus pith, excessive lemon peel or other botanicals may add their own bitterness, making it appear that the serviceberries alone are responsible.

To prevent the problem, lightly crush only some of the fruit and begin tasting after two to three weeks. Strain as soon as the infusion has adequate colour, rounded berry flavour and subtle almond depth. Do not wait for a dramatic blackcurrant-like intensity, because serviceberry is naturally gentler. If a finished batch is slightly bitter, resting and careful sweetening with sugar or honey may soften the edges. Blending with a fresh, fruitier infusion can also help. Severe seed bitterness is difficult to remove completely, so prevention through controlled preparation and timely straining is the best approach.