Toast the cumin seeds in the pan for a few minutes until fragrant, then tip into the food processor with the rest of the dried spices and ½ tsp black pepper. Juice the oranges, zest and juice the limes, then pick the oregano leaves (if using fresh). Tip the citrus juices and lime zest, the oregano, chipotle paste, vinegar and sugar into the food processor, season with a good pinch of salt, and blitz until smooth.


