1 Put a thick-based saucepan on a medium heat with the olive oil, red onion and a pinch of sea salt.
2 Let the onions gently cook until they’re soft and tender.
3 Add the sugar, apricot jam and soy sauce. Turn up the heat a notch so the mixture bubbles and reduces down (so all the liquid disappears and you have a jammy consistency).
4 Let the mixture cool as you slice the loaf into 1cm thick wedges.
5 Spread the onion marmalade onto one half of each sandwich with the crumbled cheese, walnut and fresh rocket on top.
6 Now all each sandwich needs is the top slice of bread and they’re ready to be wrapped up and packed up.