In a large frying pan, heat a little oil over high heat until
very hot, add the seasoned chicken strips and sauté until browned
all over then place in a dish to the side & keep warm.
Add the butter to the pan over medium heat, add the shallot and
garlic then sauté for 1 minute, then add the mushrooms and continue
to cook until soft.
Stir the mustard into the pan then add the stock and boil until
reduced by half then stir in the cream and boil together until rich
and unctuous.
Gently fold the chicken through the sauce, check the seasoning
adding a squeeze of lemon & serve straight away.