Steak sandwich with toffee onions & malted mustard
PREP + COOK TIME 30 MINUTES MAKES 4
30g butter
1 large onion (200g), sliced thickly
1 tablespoon brown sugar
1 tablespoon balsamic vinegar
¼ cup (70g) wholegrain mustard
2 tablespoons barley malt syrup
2 x 250g thick-cut sirloin steaks
8 x 1cm-thick slices sourdough bread (400g)
150g cheddar, grated
⅓ cup (100g) aioli
1 cup (50g)