Hi,
Thanks for the answers CK and JerryM,
I already did the recipe adding some salt at the beginning of the boiling stage, just after sealing the meat and adding the water. The meat turned out not that tender, but I will keep this recipe to precook lamb anyway as the flavour was perfect and I suppose the tenderness can be improved next time by leaving the meat longer and being more cautious about the sealing (and maybe leaving the salt out??). I ended trying Curry King Bhuna. Excellent, I will reduce the amount of onions next time and some other little changes to adjust it to my taste ;D
Regards