The day before: put the lentils to soak in cold water overnight.
The next day: start making the Rosemary Juice (see overleaf): preheat the oven to 200°C/400°F/gas 6. Chop up the lamb bones as small as possible and roast them in the oven until golden, about 1 hour (make sure you don’t allow them to burn, or scrape off any burnt bits if you do; otherwise the stoc