Pour 2 liters of water and the vinegar in a saucepan. Add the salt and bring to the boil then throw the sundried tomatoes in, wait for the water to boil again. After 3 minutes drain the tomatoes, leave them there to drain properly and dry a bit for about 2 hours.
In the meantime
sterilize some jars.
Slice the garlic and chop the chillies.
Layer the sundried tomatoes in the jars - on every second layer put a few slices of garlic and chilli. Halfway through and on the top layer add a couple of pinches of oregano. Then pour over the oil, making sure that the sundried tomatoes are completely covered otherwise they will mould.
Screw on the lid tightly. Allow about a week for the flavours to submerge before opening a jar.
Store in the refrigerator.