This is a great recipe to gift to friends who like smoky and sweet as opposed to hit-you-over-the-head heat! Subtle and truly jammy. Though raised by Brits myself, I am American enough to have read too much about safe canning practices, so I boiling-water can it, and look to the Ball Book of preserving for jar sterilization and time recommendations. Most similar "approved" recipes call for at least 15 minutes full boil, easy enough for feelings of safety, especially when giving it away! Thanks for such an interesting recipe. This one makes new and keeps old friends!
I made this yesterday, in June,using supermarket campari tomates on sale. They were much too juicy and it took forever to boil down. Recommend using meaty tomatoes in season! That said, delicious! This is a keeper!