Paleo? Banting? Watching your weight? You might want to look away now. Low carb these are not. Pretty much the opposite really. They are basically composed of sugar, syrup and butter. Oh and pecan nuts. That makes them healthy, right? The trouble with pecan pie bars is that they are so incredibly moreish, it's impossible to have just one.  The crumbly, buttery shortbread is made all the better by using brown sugar. This not only gives it a lovely golden colour but also adds a hint of caramelised flavour. The topping has a gorgeously nutty, syrupy flavour and is just soft enough...