I made this today, used orange juice as half the quantity of water plus the zest of the orange as well. I didn't add the horseradish and reduced the sugar to 170g. I didn't read the recipe correctly and added the red wine vinegar at the beginning of the recipe. I think my onion and beetroot quantities were slightly under weight which may be the reason my relish was a bit runny. I cooked it a further 5 mins on varoma with the MC off to achieve the consistency I wanted. I won't chop the beetroot for quite as long next time either but yes, I did enjoy it on cheese and crackers. Some relishes I've made have been too thick but this one will be great on my corned beef sandwiches and hamburgers.
It made 3 jars.