You will need :

          2 small zucchini cut into thick slices

          1 small onion, diced

          ½ teaspoon sugar

          1 stock cube, beef or chicken, crushed

          1 tablespoon butter

          salt and pepper

Method :

Spread butter over the middle of a sheet of foil big enough to wrap the zucchini.  Place zucchini over butter.  Sprinkle with remaining ingredients.  Wrap and seal well.  Cook in coals for about 15-20 minutes.  Turn occasionally.

PS Be generous with the foil.

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