Trim the lettuce and roughly chop it. Quarter the pears and slice out the core. Roughly chop. Peel and finely slice the ginger. Carve the skin from the lime and discard the skin. Add everything to your blender with the cashews and a cupful of ice. Blitz till smooth.
If you have time, tip your cashews into a bowl and cover with cold water and a pinch of salt. Leave over night. Then drain and rinse well. Follow the recipe. Soaking the nuts removes the enzymes which prevents your body from absorbing the nutrients.