It's like a very refine flavored marmalade. Not just for a spread on bread! Kumquat tea is also good.
I unexpectedly received Kumquats as a gift! Similar to Yuzu Jam, I experimented several times and came up with this good recipe.
This is a less soured recipe. If you like more sour taste, reduce the amount of sugar and adjust the amount of lemon juice.
Enjoy Japanese food around the world.