Halloumi and sweet potato burgers with chilli, mint and mashed avocado

Slices of halloumi and sweet potato are marinated, grilled and placed in burger buns spread with a generous amount of smashed avocado. That's vegetarian barbecuing done right.

INGREDIENTS:
250g pack halloumi, sliced into 8
1 large or 2 small sweet potatoes, thinly sliced (don’t peel)
1 red chilli, deseeded and chopped
Handful fresh mint leaves, sliced
Grated zest 1 lemon, juice ½
Olive oil to drizzle
1 large ripe avocado, chopped
2 tbsp mayonnaise
Small handful fresh coriander
Juice 1 lime
4 burger buns, halved and toasted
2 roasted red peppers from a jar, drained, sliced (we like Karyatis)

Handful wild rocket or basil to serve