Hi Charlie180.
Do you maybe mean the hot chilli sauce that some kebab shops do? I managed to get one to tell me how they did theirs a couple of years ago, it's very simple but very good.
14oz can tomato blended (or small can tom puree diluted with 2x water).
Dried red chillis (as many as you like, the more the merrier, experiment) ground.
Sugar to taste.
Lemon juice and/or white vinegar about 2/3 tsp.
1 or 2 tsp cornflower or (better) arrowroot.
Heat the toms in a saucepan till simmering.
Add the ground chilli and sugar and keep simmering (gently) for 20/30 mins.
Dissolve the cornflower/arrowroot in a little water and add to tom/chilli, continue to simmer until sauce thickens to your desired consistency.
Take off heat, stir in vinegar/ lemon juice and use immediately or cool and keep covered in fridge for a couple of days (I've used this stuff after a week and I ain't dead yet).
Have fun and feel free to play around with it, great with egg & chips and can come to rescue of a bland curry.
HTH
Regards
CoR