In a food processor, chop the onion and garlic first to the desired size. Then add the green olives to the food processor and chop to the desired size.
Add the seasonings to blend through.
Add the rest of the ingredients, processing in batches until it is all done – if you would like the pieces larger, don’t fill the processor past half way.
Put the processed relish in a large bowl and mix the ingredients together, then add the olive oil and mix, repeating until the mix reaches the desired consistency.
Taste and add more black pepper if needed (there should be plenty of salt!)
Pack the relish into the empty jars and top with some olive oil to prevent oxidation on the top.