Return water to a boil and cook haricots verts in same saucepan until crisp-tender, about 2 minutes. Using a slotted spoon, transfer to a bowl of ice water. Chill until cold, about 3 minutes. Transfer to paper towels and pat dry.

Return water in pot to a boil and cook eggs 8 minutes. Transfer eggs to bowl of ice water and chill until cold, about 5 minutes. Peel; set aside.

Meanwhile, heat 2 tablespoons oil in a small saucepan over medium-high. Add capers and cook, swirling pan occasionally, until capers burst and are crisp, about 5 minutes. Transfer capers with a slotted spoon to paper towels to drain. Let oil cool; set aside.

Put a very large saucepan on a medium heat and pour in a couple of lugs of olive oil. Add the sage leaves and fry for around 30 seconds or until dark green and crisp. Quickly remove them with a slotted spoon to a bowl lined with kitchen paper – you’ll use these for sprinkling over at the end. In the pan you’ll be left with a beautifully flavoured oil, so put it back on the heat and throw in your onion, celery, carrot, garlic, rosemary leaves, chilli and a good pinch of salt and pepper. Cook gently for about 10 minutes until the vegetables are sweet and soft. Add the squash and the stock to the pan, bring to the boil and simmer for around half an hour.

Cut the garlic clove in half, rub each ciabatta slice with garlic and drizzle with a little olive oil. Tear the mozzarella evenly over the 8 crostini. Season well with salt and pepper, sprinkle over the sliced chilli and basil leaves and grate over the lemon zest. Finish with another drizzle of olive oil.