There is real art in making truly delicious lunches, no longer are we a generation of simply ham, cheddar and branston pickle, instead we choose a more indulgent fromage and add trendy favourites such as avocado or rocket or decide to whip up a frittata or Quesadilla. During National Sandwich Week (8-14 May 2016), London Mums reveal their favourite recipe: HAM, SWISS CHEESE AND ARRABBIATA SAUCE…