1.Make green peppercorn and tarragon dressing. Place ingredients in screw-top jar; shake well.
2.Boil, steam or microwave potatoes until just tender, drain.
3.Meanwhile, coat chicken all over in black pepper. Cook chicken on heated oiled grill plate (or grill or barbecue) until browned all over and cooked through, slice thickly.
4.When potatoes are cool enough to handle, slice thickly. Cook potato, in batches, on same heated oiled grill plate until browned both sides.
5.Arrange chicken, potato, tomato and onion slices on serving plates, drizzle with dressing.
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