If left to maturity, these vegetables will grow very large, but they are at their best when young and tender. Choose them small and firm, with bright colour and no bruises or soft spots, particularly at the stem end. Pattypans should be 5 cm across, yellow squashes, marrows and zucchini up to 15 cm long.

Their tender skin bruises easily, so handle with care. Store in the refrigerator for up to five days, wrapped in plastic to protect from drying.