Rinse your pearl barley. Tip into a lidded pan. Add a pinch of salt and enough water to cover the barley by 1cm. Bring to the boil. Pop a lid on. Lower heat. Simmer 25 mins or all the water's absorbed and the barley's full tender. Top up with water while it cooks, if needed.
Slice the base from your lettuces and arrange on a large platter or individual plates.
Finely dice your cucumber. Chop your herbs - discarding any tough woody mint or parsley stalks. Fold the balsamic, cucumber, herbs, cinnamon, lemon zest and juice through your barley once it's cooked. Season well. Gloss with a little oil. Taste and tweak seasoning to your liking.
Pile the dolled up pearl barley onto your bed of lettuce leaves. Dot the raspberries over the top and get stuck in. Delicious on it's own or paired with grilled or smoked mackerel.