Quick Answer

To make perfect marmalade, start with high-quality citrus, prepare the fruit properly, and use a reliable preserving jar like Kilner® preserve jars for sealing. Follow a tested recipe, monitor the setting point, and sterilize your jars to ensure a good seal and long shelf life.

Marmalade is a breakfast staple, but making it at home can seem intimidating. With the right technique and equipment, you can create a bright, bitter-sweet spread that beats anything from the store. This guide walks you through each step, from choosing fruit to sealing your jars, so you can confidently make your own.

Kilner® preserve jars are a classic choice for marmalade making. Their clip-top design creates an airtight seal that keeps your preserves fresh. Whether you're a first-timer or a seasoned jam maker, these jars help ensure your marmalade stays delicious for months.

Choosing Your Citrus and Preparing the Fruit

The foundation of great marmalade is the fruit. Seville oranges are traditional for their bitter edge, but you can also use a mix of sweet oranges, lemons, or grapefruit. Look for firm, unblemished fruit with fragrant skin. Wash them thoroughly to remove any wax or residue.

Slice the fruit thinly, removing seeds and pith as you go. The pith contains pectin, which helps the marmalade set, so don't discard it entirely—tie it in a muslin bag and add it to the pot. This technique extracts natural pectin without leaving bits of pith in your final product.

  • Weigh your fruit before you start to ensure you have the right amount of sugar later.
  • Use a sharp knife or a mandoline for even, thin slices.

Cooking the Marmalade to the Right Set

Combine the prepared fruit with water in a large, heavy-bottomed pot. Bring to a boil, then simmer gently until the fruit is soft and the peel is translucent. This can take up to an hour. Stir occasionally to prevent sticking.

Add sugar and stir until completely dissolved. Then, increase the heat and boil rapidly. To test for the setting point, place a small amount on a chilled plate and push it with your finger. If it wrinkles, it's ready. Alternatively, use a sugar thermometer—it should read 105°C (220°F).

  • Skim off any foam that rises to the surface for a clear marmalade.
  • Let the marmalade rest for 10 minutes before jarring to prevent fruit sinking.

Sterilizing and Filling Your Kilner® Jars

Proper sterilization is crucial for preserving. Wash your Kilner® jars and lids in hot, soapy water, then rinse. Place them in a low oven (140°C/275°F) for 15 minutes to dry and sterilize. Alternatively, boil them in a large pot of water for 10 minutes.

Carefully ladle the hot marmalade into the warm jars, leaving a small headspace. Wipe the rims clean with a damp cloth to ensure a good seal. Secure the clip-top lids while the marmalade is still hot. As it cools, the vacuum will form, creating an airtight seal.

  • Always use new rubber seals for a reliable closure.
  • Check that the lid doesn't flex when pressed after cooling—it should be firm.

Step-by-Step Guide to Perfect Marmalade

  1. Prepare your fruit: Wash, slice, and deseed your citrus. Tie pith and seeds in a muslin bag to add pectin. Checkpoint: Your slices should be even; remove any seeds you see.
  2. Soak and simmer: Soak the fruit in water overnight (optional) to soften the peel. Simmer until the peel is tender and the liquid has reduced. Checkpoint: The peel should be easily pierced with a fork.
  3. Add sugar and boil: Stir in sugar until dissolved. Boil rapidly until setting point is reached (105°C/220°F). Checkpoint: Use the wrinkle test on a cold plate.
  4. Rest and skim: Remove from heat, skim off foam, and let stand for 10 minutes to distribute fruit evenly. Common mistake: Skipping the rest can cause fruit to float.
  5. Sterilize jars: Wash and sterilize Kilner® jars and lids in the oven or boiling water. Checkpoint: Jars should be warm when filling to prevent cracking.
  6. Fill and seal: Ladle marmalade into jars, wipe rims, and secure clip-top lids while hot. Checkpoint: After cooling, press the center of the lid—it should not move.

Kilner® Jars for Your Marmalade

Kilner® 0.5 Litre Preserve Jar

Kilner® 0.5 litre preserve jar

  • Kilner Round Glass Clip Top Preserving Jar, 1 Litre: The Kilner 1 Litre Round Clip Top Glass Storage Jar is perfect for preserving healthy, home-grown foods such as jams, chutneys, and pickled vegetables. If you make large batches, the 1-litre jar is a practical choice. It stores a generous amount and works well for longer-term pantry storage.

Making marmalade at home is rewarding and simpler than you think. With Kilner® preserve jars, you can ensure your homemade marmalade stays fresh and delicious. Try this recipe and enjoy the bright, citrusy flavor of your own preserve.