What is the difference between marmalade and jam?
Marmalade includes citrus peel (or other citrus rind) for that signature bittersweet bite. Jam usually uses peeled fruit and has a softer, more uniform texture.
Why does my marmalade taste bitter?
The bitterness mostly comes from the white pith, membranes, and the peel. A few fixes: slice the peel thinner, remove as much pith as you can, and do not skip the blanch. Seville oranges are the classic bitter orange, and some navels with thick pith can taste more bitter than you expect, so taste your fruit and adjust the blanching if needed.
How do I know when it is set without a thermometer?
Use the cold plate test: chill a small plate in the freezer. Spoon a little marmalade onto it, wait 30 seconds, then drag your finger through. If it wrinkles and the line holds, you are there. If it runs like syrup, simmer a few more minutes and test again.
What is the set temperature?
The common target is 220°F at sea level, but it can be a little lower at higher altitudes and depends on thermometer accuracy. Use temperature as a guide and back it up with the cold plate test and visual cues (thicker bubbles, spoon leaves a brief trail).
What oranges work best?
Seville oranges are the classic, but they are seasonal and extra bitter. For everyday marmalade, I like a mix of navel oranges (sweet) and one blood orange if you have it (deeper flavor), or just all navels plus lemon for balance. Fruit size and juiciness vary, so cook time can vary too.
Can I reduce the sugar?
You can, but the set and shelf life will suffer because sugar is doing structural work here. If you reduce it, expect a softer marmalade and store it in the fridge, using it within about 1 to 2 weeks.
Help, it will not set
Keep simmering in 3 to 5 minute bursts and re-test. Citrus sets from a mix of natural pectin, sugar, and reduction, and some fruit is just lower-pectin. If it still stays loose, call it a win and use it as a spoonable citrus syrup for yogurt and pancakes.
Help, it is too thick
Warm it gently and stir in a splash of water (start with 1 teaspoon at a time) until it loosens.
Why did mine crystallize?
Crystals usually come from undissolved sugar or sugar stuck on the sides of the pot. Stir until fully dissolved before the strong simmer, avoid vigorous scraping once it is thick, and wipe down the pot sides with a damp brush if you see crystals forming.
Is foam a problem?
Nope. Foam is normal. Skim it if you want a clearer, shinier jar.