Step 1

Light the barbecue. Put all the spice mix ingredients in a mortar or blender and grind well. Chargrill the peppers on the barbie until black. When cool enough to handle, peel, seed, cut into finger-length strips and set aside.

Step 2

Dip the pork in the melted butter, then roll it in the spice mixture until well covered. Heat a heavy frying pan or griddle pan on the barbecue. Drizzle a little melted butter into the pan and fry the meat for 10 minutes, turning occasionally until slightly blackened.

Step 3

Remove the pork from the pan, wipe the pan with kitchen paper then return the pork to it. Drizzle over a little more melted butter, throw in the peppers and tomato sauce and pour over the beer. Simmer for 15-20 minutes, stirring occasionally, until the sauce is thick and coating the pork.

Step 4

Using tongs, remove the pork from the pan. Cut it into slices and arrange on a serving plate. Stir the sugar into the sauce and pour it over the pork. Scatter over the celery leaves or rocket, and serve.