Grapefruit Marmalade

"Grapefruit is my favorite from the Citrus family, so I thought rather than an orange marmalade, I'd try a grapefruit marmalade and I'm so glad I did! Marmalade is really very easy to make, as you will see."
-- @artsiegirl
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  • Recipe Card
Prep time 10mins
Cook time 1hr 20mins
Serves or Makes: 4 pints

Recipe Card


  • 5 medium grapefruit
  • 1 tablespoons zested lemon
  • 6 cups water
  • 8 cups granulated sugar


  • Step 1

    Wash the grapefruit and lemon, since you will be using the rind of both. Using a mandolin, slice the grapefruit to 1/8", removing the seeds as you go. Then cut the slices in about 4 pieces. Zest the lemon and set aside. Place the grapefruit into at least an 8-quart pot. Add the lemon zest and the water to the pot, set over high heat and bring to a boil, approximately 10 minutes. Once boiling, reduce the heat to maintain a rapid simmer and cook, stirring frequently, for 40 minutes or until the citrus is very soft.

  • Step 2

    Add the sugar and stir the mixture continually, until it reaches 223 F (or 106 C) on a candy thermometer, about 15 to 20 minutes. Don't let it boil over. You can test the readiness of the marmalade by freezing a small plate and then taking a teaspoon of the marmalade and placing it on the frozen plate. Wait 30 seconds, and tilt the plate to test the thickness. It should be soft, but thick.

  • Step 3

    Refrigerate one pint of marmalade and either can, or freeze the rest.

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