This is based on Alton Brown's recipe. I like to make mine with a little grapefruit to add a little extra zing.
4-5 oranges - use juice oranges not navels, thinly sliced on a mandoline, seeds removed, and chopped
1 grapefruit, thinly sliced on a mandoline, seeds removed, and chopped
1 lemon, zest grated and juiced
6 cups of water
3 lbs plus 12 oz sugar
1. Put the oranges into a large pot (8-10qt pot). Add the lemon juice and zest and water. Bring to a boil then reduce heat to a rapid simmer and cook, stirring frequently for about 40 minutes - fruit should be very soft.
2. While the oranges are cooking, sterilize the jars and lids in a large pot of boiling water for five minutes. Remove and let dry.
3. Place a small plate in the freezer (so that you can test the consistency of the marmalade later).
4. Bring the orange mixture back to a full boil over high heat and add the sugar. Mix continually until it reaches 223 degrees on a candy thermometer and it's dark in color. It will take quite a while to get dark - wait until it does or you'll have soupy marmalade/failed batch. It should be bubbling up quite a bit, play with the heat if you need to but keep the temp as high as possible and let it thicken.
5. Test the readiness by putting a teaspoon of marmalade on the frozen plate. Wait 30 seconds - if it sets and gels, you're all set. If it runs, keeps cooking.
6. Pour the marmalade into the jars using a funnel. Top and seal the jars.
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