down and simmer, covered, for 2 hours, or until the flanks
12 are tender and the shoulder meat is beginning to come
13 away from the bone. Remove and set aside.
14 • Continue to reduce the stock until its volume is about
15 500ml. Strain the bones and vegetable matter from
16 the stock and discard. Return the stock to the pan and
17 continue to reduce.
18 • Once its volume is about 250ml, line a very fine sieve
19 with muslin or a new, clean chux cloth and pass the sauce
20 through into a smaller saucepan.
21 • Return the sauce to a very low heat and allow to
22 evaporate to ~200ml.
23 • Finish with the sour cream and Dijon mustard before
24 serving