CRISPED KALE WITH ROSEMARY & OLIVE OIL, £1.50, PRET (15g)
KALE, hailed as a superfood, has been dried for 16 hours and tossed with salt, garlic and a bit of palm sugar. Pret is right in describing the contents as ‘fragile’. You’re paying 10p for every gram of kale. The air comes free.