Refreshing Canning Watermelon Juice

I’ve always been a big fan of preserving summer’s sweetness for those cold winter months. There’s something special about opening up a jar of homemade watermelon juice when the snow is falling outside. As someone who hates seeing good fruit go to waste, I started canning watermelon juice a few years ago when my local farmer’s market had an amazing deal on late-season melons.

What I love most about this recipe is how simple it really is. You don’t need fancy equipment or years of canning experience – just some basic supplies and a little patience. I usually make a big batch on weekend afternoons while my kids help slice the watermelon (and sneak pieces when they think I’m not looking).

If you’ve never tried canning before, watermelon juice is a great place to start. It’s straightforward, and the results are so worth it. Plus, there’s nothing quite like offering guests a glass of summer-fresh watermelon juice in the middle of January!

What Kind of Watermelon Should I Use?

For juicing watermelon, you’ll want to pick a melon that’s fully ripe and sweet – this means looking for one that feels heavy for its size and has a yellow spot where it sat on the ground. Seedless watermelons are easier to work with since you won’t have to strain out the seeds, but seeded varieties are perfectly fine too and often have a more intense flavor. The flesh should be bright red (not pale pink) and firm rather than mushy. If you’re buying pre-cut watermelon, check that the flesh isn’t mealy or separating from itself, as these are signs the melon is past its prime. A good tip is to thump the watermelon – a ripe one will have a hollow sound when you knock on it.

Options for Substitutions

When it comes to canning, it’s important to maintain safe acidity levels, but there are still some substitution options available:

• White sugar: You can replace the white sugar with an equal amount of raw cane sugar. However, artificial sweeteners are not recommended for canning as they can become bitter and don’t help preserve the juice.
• Store-bought lemon juice: This is one ingredient you shouldn’t substitute! Store-bought lemon juice has consistent acidity levels that are crucial for safe canning. Fresh lemon juice varies in acidity and isn’t safe for this recipe.
• Watermelon: While any variety of red watermelon works well, avoid using yellow or orange watermelon varieties as they may alter the final taste and color. Make sure to use ripe, fresh watermelon for the best results.

Watch Out for These Mistakes While Canning

The biggest challenge when canning watermelon juice is achieving the right acidity level to make it safe for storage – that’s why the lemon juice ratio in this recipe is crucial and shouldn’t be reduced or substituted with fresh-squeezed lemons, which have variable acidity levels.

Another common mistake is not properly sterilizing your jars and lids – make sure to boil them for at least 10 minutes before filling, and always check for chips or cracks that could compromise the seal.

The processing time starts only when the water is at a full rolling boil with 1-2 inches of water covering the jar lids, and reducing this time can lead to spoilage.

For the best flavor and color retention, choose ripe but firm watermelon and avoid using overripe fruit, which can lead to a mushy end product and potential fermentation during storage.

What to Serve With Watermelon Juice?

This sweet and refreshing canned watermelon juice makes a perfect base for summer drinks and cocktails! You can serve it over ice with a splash of sparkling water and fresh mint leaves for a quick mocktail, or mix it with your favorite spirits for an easy cocktail. For brunch, try pairing it with light breakfast foods like yogurt parfaits or fruit salads – the juice’s natural sweetness complements these morning treats perfectly. If you’re serving it at a cookout, this juice goes great with grilled foods like chicken skewers or burgers, helping to cool things down on a hot day.

Storage Instructions

Shelf Storage: When properly canned and sealed, your watermelon juice will keep well in a cool, dark pantry or cabinet for up to 12 months. Make sure to check that all jar lids are properly sealed before storing – they shouldn’t flex when pressed in the center.

After Opening: Once you’ve cracked open a jar, transfer any unused juice to the refrigerator. The juice will stay fresh for about 7-10 days in the fridge. Give it a quick shake before serving, as natural separation might occur.

Quality Check: Keep an eye on your canned juice throughout storage. If you notice any change in color, odd smells, or if the lid becomes unsealed, it’s best to discard the juice. Always label your jars with the canning date to help track freshness.

Preparation Time	15-20 minutes
Cooking Time	15-30 minutes
Total Time	30-50 minutes
Level of Difficulty	Medium

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 8400-8600
• Protein: 0-10 g
• Fat: 0-10 g
• Carbohydrates: 2100-2200 g

Ingredients

• 4 cups store-bought lemon juice (I use Santa Cruz Organic lemon juice)
• 6 cups strained watermelon puree
• 6 cups white sugar

Step 1: Prepare the Watermelon Lemonade Base

Add the watermelon juice, lemon juice, and granulated sugar to a large pot.

Heat the mixture to 190°F (88°C), stirring often to dissolve the sugar evenly.

Once heated, remove the pot from the heat to prevent further cooking.

Step 2: Fill and Seal the Jars

Carefully ladle the hot concentrate into prepared quart jars, leaving a 1/4-inch headspace.

Use a chopstick or knife to remove any air bubbles from the jars, and add more liquid if necessary to maintain the proper headspace.

Wipe down the rims and sides of each jar to ensure a clean seal and apply two-piece canning lids, tightening them until fingertip tight.

Step 3: Process in a Hot Water Bath

Load the filled jars into a prepared hot water bath canner.

Process them for 10 minutes, adjusting the time according to your altitude if necessary.

Refer to specific canning guides for times based on altitude differences.

Step 4: Cool and Check Seals

Using a jar lifter, carefully transfer the jars to a clean surface lined with a kitchen towel, ensuring at least 1 inch of space between each jar.

Allow the jars to cool to room temperature over 12 to 24 hours.

Once cooled, check the seal of each jar.

If any jars have not sealed, move them to the refrigerator for immediate use.

Step 5: Store Properly

For sealed jars, remove the canning rings and store them in a cool, dry place away from direct sunlight.

Use the concentrate within 6 months to ensure optimal flavor.

Step 6: Reconstitute the Concentrate

To enjoy your homemade watermelon lemonade, combine the concentrate with still or sparkling water.

A good ratio to try is 1.5 parts water to 1 part concentrate, but feel free to adjust to taste.