Blitz the spice paste ingredients with 2 tablespoons oil in a food processor or with a stick blender until you have a chunky puree.
Heat a few tablespoons olive oil in a large frying pan and stir-fry beef for a few minutes or until well browned all over. Remove from the pan and keep warm.
Add the spice paste to the pan and cook, stirring for about a minute or until the spice paste smells fragrant.
Add tomato, chilli and vinegar and bring to a simmer. Cook gently for about 10 minutes or until the sauce has thickened slightly.
Return the beef and any juices to the pan and bring back to a simmer. Taste, season and serve hot on a bed of cauliflower 'rice'.