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Malachite Burgers

For 4 burgers:
* 4 slices Welsh slate
* 1kg malachite

Cut the slates in two. (Use a trowel for this. Oxy-acetylene cutters cause the slate to crumble.)

Break up the malachite with a sledge hammer. Divide the malachite equally among four slates and cover with the remaining four.

Bake at 1200°C for 12 hours by which time the malachite shuold be a beautiful bubbly green. Cool and eat. Excellent for picnics, as they can be prepared the century before.

A dry gritty flavour.