A much easier free version
I've been going to Slimming World since 28 December. I love the SW chips, but wanted a free substitute for ketchup.
I buy a jar of passata, and freeze it in ice cube trays. When I want some ketchup, I take a cube (or however many I want) out of the freezer (defrost in the microwave if I have not planned ahead). Then add a splash of vinegar and pinch of Candarel.
It's not exactly Heinz, but it's OK, and it's free as well as being fairly instant to make. You could also add onion or garlic or anything else you fancy to make it taste better.
Annie