1.   An even thickness is more important than an even edge.

2.   Fold half the walnuts with a spatula, and pour into the prepared pan, spreading it to an even thickness.

3.   Place the sole fillets between pieces of plastic wrap, and pound lightly with a kitchen mallet to flatten to an even thickness.

4.   Use your fist or the flat side of a mallet to pound the chicken to a more even thickness.