I had some spare chillies......
Blitz/finely chop as many as you like, a good handful. Any colour, any sort, it does not matter.
Gently heat 500ml of a flavourless oil - sunflour or rapeseed - and add the chillies. Heat gently for 3- 4 minutes. Leave to cool and then seal the pan with a lid and clingfilm and put in a cool dark place for three days.
Reheat the pan gently and pour the oil through muslin into a bottle - do not press. When cool cap the bottle.
It makes a great base for a 'hot' salad dressing or to cook a stir fry or to mix in a dip.