Best Ruby Red Grapefruit Marmalade Recipes

GRAPEFRUIT MARMALADE

Steps:

• Bring a large, covered pot of water to boil with the whole citrus fruit. This Cuisinart pot from Amazon is a decent size for the job. Boil the fruit until they are very tender and soft. Grapefruit take about 2.5 hours. Drain the fruit and let them cool slightly before proceeding.
• Place a cutting board inside a rimmed baking sheet (these Nordic Ware sheet pans from Amazon are great). This is to catch all the citrus juices! Slice each fruit in half to expose the seeds. Remove the seeds if there are any, then quarter each half. Seperate the flesh from the peel so that you can slice the peel thinly and chop the flesh, removing any membranes if they are tough. Transfer the sliced peel, flesh, and juices into a large pot (like this Cuisinart pot from Amazon).
• To the large pot of chopped fruit, add the sugar and the lemon juice. Clip on your thermometer (like this fast-reading digital thermometer from Thermoworks). Bring the mixture to a boil on medium-high, stirring with a wooden spoon or heatproof spatula (grab this spatula from Amazon). When the mixture is boiling, this is when you want to start monitoring the temperature. Boil the mixture, stirring constantly, until it reaches 220°F (104-105 ºC). When the marmalade reaches this temperature, slide the pan off the heat, and let it cool for 2 minutes, then add the vanilla bean paste and give the marmalade a good stir. This is to ensure that your canned marmalade will have an even dispersion of peel/fruit and vanilla bean seeds.
• Divide the mixture between 5 or 6 sterilized jars (I prefer wide-mouth mason jars like these Ball jars on Amazon), leaving a headspace of 1/4 inch. If the 6th jar has a larger headspace, you are just going to have to eat it. Just kidding. Well, except that you can't seal it to store at room temperature, so that will be your jar to enjoy right away, storing it in the fridge. Wipe the rims of all the jars with a lightly moistened paper towel. Top each of the jars with a sterilized lid, and tighten the band until it is finger tight. The Ball canning kit on Amazon is key for this step and the next! Get it on Amazon
• Line a rimmed baking sheet with a large kitchen towel (these Nordic Ware sheet pans from Amazon are great). This will be the "cooling station" for the processed jars. To seal the jars, place them in a large pot, with a towel at the bottom to prevent them from rattling and cracking. Fill the pot with hot water so that the jars are completely immersed. Bring the pot of water to a boil with the lid on and once the boiling point has been reached, boil the jars for 5 minutes. Then take the pan off the heat, and let the jars stand in the pan for another 5 minutes. Finally, carefully remove the jars from the water bath and place them on the towel-lined baking sheet. You will hear a popping sound soon after, a good sign that the vacuum seal is proper. Let the jars cool, untouched, for 24 hours before putting them away.

GRAPEFRUIT MARMALADE

Steps:

• Inspect two 5-ounce jars for cracks and rings for rust, discarding any defective ones. Immerse in simmering water until marmalade is ready. Wash new, unused lids and rings in warm soapy water.
• Thoroughly wash and dry the grapefruits. Run a zester around 2 grapefruits to produce ribbons of zest. Set aside. Cut away thin strips of peel from the other two grapefruits with a sharp paring knife.
• Peel off all remaining outer white parts of the fruit and discard. Cut the grapefruits into wheels. Remove any seeds.
• Put grapefruit wheels and zest strips into a non-reactive saucepan. Add sugar and stir well to cover fruit. Heat over medium-high heat until bubbling, mixing constantly. Smash the heated fruit until it liquefies. Reduce heat to low and cook over a steady boil, stirring often. Remove and discard any persistent white froth that won't disappear after being stirred. Continue to cook for about 10 minutes until marmalade begins to coat the back of a spoon.
• Add zest ribbons and cook for 5 minutes more. Place a small amount of marmalade on a plate and put it in the freezer. Test the consistency after 3 minutes.
• Remove the marmalade from the heat when the freezer sample meets your desired consistency.
• Pack grapefruit jam into hot, sterilized jars, filling to within 1/4 inch of the top. Run a clean knife or thin spatula around the insides of the jars to remove any air bubbles. Wipe rims with a moist paper towel to remove any residue. Top with lids and screw rings on tightly.
• Place a rack in the bottom of a large stockpot and fill halfway with water. Bring to a boil and lower jars 2 inches apart into the boiling water using a holder. Pour in more boiling water to cover jars by at least 1 inch. Bring to a rolling boil, cover, and process for 10 minutes.
• Remove the jars from the stockpot and let rest, several inches apart, for 24 hours. Press the center of each lid with a finger to ensure the lid does not move up or down. Remove the rings for storage and store in a cool, dark area.