Preheat your oven to 220°C/200°C fan/gas mark 7.

Chop the potatoes into 2cm wide wedges (no need to peel). Pop them onto a large baking tray.

Drizzle with oil, season with salt and pepper, sprinkle over the dried rosemary, then toss to coat. Spread out in a single layer. TIP: Use two baking trays if necessary.

When the oven is hot, roast on the top shelf until golden, 25-35 mins. Turn halfway through.

Meanwhile, halve, peel and thinly slice the red onion. Heat a drizzle of oil in a large frying pan on medium-high heat.

Once hot, add the onion, season with salt and pepper and fry, stirring occasionally, until golden, 10-12 mins.

Add half the balsamic vinegar and the sugar (see pantry for amount) and cook until caramelised, 1-2 mins more.

Transfer to a small bowl and set aside. Wipe out your (now empty) pan.

Remove the stems from the portobello mushrooms (but leave the mushroom whole).

Return the frying pan to medium-high heat with a drizzle of oil.

Once hot, add the mushrooms and season with salt and pepper. Fry until golden brown, 4-5 mins, then turn over and cook for a further 4-5 mins.

About 10 mins before the wedges are cooked, move them to the middle shelf of the oven.

Transfer the mushrooms, cup-side up, to another baking tray. Divide the goat's cheese between them, then bake on the top shelf until the cheese has melted, 8-10 mins.

Meanwhile, halve the ciabattas. For the last 3-4 mins, add them to the oven to toast and warm though.

Carefully drain any excess liquid from the portobello mushrooms.

Meanwhile, pop the remaining balsamic vinegar and a drizzle of olive oil into a bowl. Season with salt and pepper, then mix together.

Just before the mushrooms are ready, add the baby leaves to the dressing and toss to coat. TIP: Don't add the leaves too early or they'll go soggy.

When everything's ready, top the base of each ciabatta half with a cheesy mushroom, some caramelised onions and a handful of baby leaves, then sandwich shut with the ciabatta lid.

Serve with the wedges and remaining baby leaves alongside.