Halve the rutabaga and cut into 8 slices of about 2 cm thick. Bring the vegetable stock to the boil and cook the slices for about 15 minutes until soft. Take them out and let them drip off on kitchen paper.
Wash and drain the salad. Drain the corn. Mix salad and corn. Season sour cream with salt, pepper and sugar. Heat the grill pan and spread with oil. Grill the turnips in it in 2 portions on each side for about 3 minutes.
At the end spread with salsa. Arrange salad and turnip steaks on plates. Pour sour cream over the salad. Add the rest of the salsa.