Slice the top off the cob, this will become the lid
Scoop out the soft centre, until you have a bread bowl. The spare bread can be whizzed up into breadcrumbs and frozen until you need them for another dish
Spread the base of the bread bowl with pesto
Add a layer of baby spinach, then a layer of sun-dried tomatoes. Top with basil leaves, then a layer of creamy mozzarella. The next layer is the pepper, then a layer of sliced beetroot. Finally replace the lid
Wrap your cob tightly with clingfilm and place in the fridge with a tin of baked beans on top for weight. This will help compress the layers
Leave in the fridge to chill and compress for a few hours or overnight. Take the whole cob to your picnic, and then slice open to reveal a rainbow of colours.