Shredded Lamb & Pickled Carrot Sarmie

Leftover lamb reimagined with a tangy twist.

¼ cup sugar ½ cup vinegar 1 cup water 1 tsp fennel seeds ½ tsp black peppercorns large pinch of salt 3 carrots 4 burger buns leftover lamb shoulder 100ml umami vinaigrette 125g mayonnaise small handful coriander