On a chopping board, carefully halve the rolls across the middle using a bread knife, to give you a top and a base for each. Put to one side.
Using an eating knife, cut each radish in half lengthways, then slice each radish half into 3 pieces and place into a large bowl.
Cut the cucumber in half lengthways, scoop out the watery seeds with a teaspoon and discard. Slice each cucumber half into 4 pieces, then add to the bowl.
Trim the carrot, then cut into 8 even-sized pieces and add to the bowl.
Click apart the cauliflower florets and place into the bowl with the stalks.
Pull out the pepper’s stalk, tearing out the core, then discard. Scoop out the seeds and white pith with a teaspoon, then discard. Cut the pepper into 4 slices, then cut each slice into 4 pieces. Add the pieces to the bowl.
Remove the core from the apple half and place, flat-side down, on the board. Cut it into 6 even-sized pieces, then add to the bowl.
Place a clean tea towel onto the chopping board and place the vegetables and chopped apple in a pile in the middle.
Fold over each corner of the tea towel so your ingredients are wrapped up like a parcel – make sure there are no gaps to stop the vegetables from escaping.
Carefully crush and squash the vegetables with a rolling pin until broken down into little pieces. Open up the parcel – if your pieces are still too big, wrap it back up and crush and squash again.
Measure the balsamic vinegar and extra virgin olive oil into the empty bowl to make your dressing.
Pick the herb leaves, discarding the stalks. Tear the leaves into small pieces, adding them to the bowl as you go.
Using scissors, snip the cress or sprouting herbs into the bowl, then add the peas and sunflower seeds.
Add the squashed vegetables to the bowl, then using the tips of your fingers, carefully toss them in the dressing so they’re nicely coated.
Spread the base of each roll with the cottage or cream cheese, then spread the soft side of each top with the houmous.
Divide the vegetable mixture equally between the base of each roll. Place the lids on top, houmous-side down, press lightly, then tuck in!
Jamie's top tip: When beetroot is in season, I like to add it here for extra colour and flavour. Feel free to swap in your own favourite seasonal veg – just make sure it has a bit of crunch!