1.Combine juice, oil, sumac and chicken in medium bowl; stand 5 minutes.
2.Meanwhile, make coriander aïoli. Combine ingredients in small bowl.
3.Drain chicken; reserve marinade. Cook chicken on heated oiled grill plate (or grill or barbecue) until cooked through, brushing with reserved marinade after turning. Cover; stand 5 minutes then slice thinly.
4.Halve bread horizontally; cut each piece into six slices. Toast slices lightly.
5.Spread each toast slice with aïoli. Layer four toast slices with half the chicken, cucumber, tomato and lettuce; top with toasts then layer with remaining chicken, cucumber, tomato and lettuce and top with remaining toast. Cut in half to serve.
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