How to Make the Best Zucchini Relish at Home

Quick Answer: Zucchini relish is a sweet and tangy condiment made by simmering finely chopped zucchini, onions, and bell peppers in a vinegar, sugar, and spice brine. It’s one of the best ways to preserve an abundant zucchini harvest and makes a delicious topping for burgers, hot dogs, sandwiches, and grilled meats. If you’re ready to make it, use the Jump to Recipe button below for the complete ingredient list and step-by-step instructions.

❤️ Why You’ll Love This Recipe

• A delicious way to use up extra garden zucchini.
• Sweet, tangy, and perfectly balanced with warm spices.
• Great for both refrigerator storage and water bath canning.
• Makes a versatile condiment for sandwiches, burgers, and grilled meats.
• Easy to make in large batches for long-term storage.

Ingredients You’ll Need

• 10 cups finely chopped zucchini (about 1.2 kg) – Fresh zucchini is the star of this relish, providing a mild flavor that absorbs the sweet and tangy brine beautifully.
• 4 cups chopped onions (about 640 g) – Adds savory depth and balances the sweetness.
• 2 cups chopped red and green bell peppers (about 280 g) – Brings color, texture, and a subtle sweetness.
• ¼ cup kosher salt (about 36 g) – Draws excess moisture from the vegetables, helping the finished relish stay crisp instead of mushy.
• 2½ cups apple cider vinegar (600 ml) – Gives the relish its signature tangy flavor while providing the acidity needed for safe water bath canning.
• 2 cups granulated sugar (400 g) – Balances the vinegar for a classic sweet-and-tangy relish.
• 1 tablespoon mustard seed (about 15 g) – Adds a mild earthy flavor and traditional relish taste.
• 1 teaspoon celery seed (about 2 g) – Enhances the savory flavor with subtle herbal notes.
• 1 teaspoon ground turmeric (about 3 g) – Gives the relish its beautiful golden-yellow color while adding gentle warmth.

Equipment You’ll Need

• Large mixing bowl
• Measuring cups and spoons
• Sharp knife and cutting board
• Colander
• Clean kitchen towel
• Large stainless steel pot
• Wooden spoon or silicone spatula
• Sterilized pint or half-pint canning jars
• Lids and rings
• Jar funnel
• Bubble remover or plastic utensil
• Water bath canner (for shelf-stable storage)

How to Make Zucchini Relish

1. Salt the vegetables.
   Combine the chopped zucchini, onions, and bell peppers in a large bowl. Toss with the kosher salt, cover, and let the mixture sit at room temperature for 2 hours. This step removes excess moisture and helps keep the finished relish crisp.
2. Drain and squeeze dry.
   Transfer the vegetables to a colander and rinse thoroughly under cold water to remove the excess salt. Using a clean kitchen towel, squeeze out as much liquid as possible.
3. Prepare the brine.
   In a large stainless steel pot, combine the apple cider vinegar, sugar, mustard seed, celery seed, and turmeric. Bring the mixture to a boil, stirring until the sugar has completely dissolved.
4. Cook the relish.
   Add the drained vegetables to the boiling brine. Reduce the heat and simmer for 10 to 15 minutes, or until the vegetables become slightly translucent and the relish thickens.
5. Fill the jars.
   Ladle the hot relish into sterilized jars, leaving ½ inch of headspace. Remove any trapped air bubbles, wipe the rims clean, and secure the lids.
6. Process for canning (optional).
   Process the filled jars in a boiling water bath canner according to your elevation. Pint and half-pint jars should be processed for 10 minutes below 1,000 feet or 15 minutes between 1,001 and 6,000 feet.

Tips for the Best Zucchini Relish

1. Don’t skip the salting step. It removes excess moisture, preventing watery, mushy relish.
2. Squeeze the vegetables well. Removing as much liquid as possible helps maintain the proper vinegar concentration and creates a better texture.
3. Use young zucchini when possible. Large, overgrown zucchini with tough skins and big seeds can make the relish watery and bitter.
4. Don’t overcook the vegetables. Simmer only until they’re slightly translucent to preserve a pleasant texture.
5. Maintain the vinegar ratio. Avoid reducing the vinegar or increasing the vegetables, as changing the acid level can make the recipe unsafe for water bath canning.
6. Sterilize your jars. Clean, sterilized jars improve food safety and help create a reliable seal.
7. Adjust canning time for elevation. Follow the recommended processing time based on where you live to ensure safe preservation.
8. Store sealed jars in a cool, dark place. Proper storage helps maximize shelf life and maintain the relish’s flavor and quality.

If you have extra zucchini, you can also try baking Blueberry Banana Zucchini Bread or Zucchini Brownies to use up your harvurgers instead of traditional pickle relish.

Storage & Make-Ahead

Refrigerator

Store homemade zucchini relish in an airtight container in the refrigerator for 1 to 2 months after opening. Keeping the relish chilled helps preserve its fresh flavor and crisp texture.

Pantry (Properly Canned)

When processed correctly using a boiling water bath canner, unopened jars can be stored in a cool, dark pantry for up to 18 months. Before using, always inspect the jar for signs of spoilage such as a bulging lid, cloudy liquid, or an off smell.

Freezer

If you prefer not to can your relish, freeze it in freezer-safe containers for up to 6 months. Leave at least 1 inch of headspace to allow for expansion during freezing. Thaw overnight in the refrigerator before serving.

Make-Ahead

Zucchini relish is an excellent make-ahead condiment. Prepare and can it during zucchini season, and you’ll have homemade relish ready for sandwiches, burgers, and barbecues throughout the year.

Easy Variations

• Sugar-Free or Keto Version – Replace the granulated sugar with an equal amount of erythritol or monk fruit sweetener for a lower-carb relish while maintaining its sweet-tangy flavor.
• White Vinegar Instead of Apple Cider Vinegar – Substitute white vinegar if preferred. It produces a sharper, more pronounced tang, while apple cider vinegar offers a slightly milder, fruitier flavor.
• Refrigerator Relish – Skip the water bath canning process and store the finished relish in the refrigerator or freezer instead.

What to Serve With

This sweet and tangy zucchini relish pairs well with many savory dishes, including:

• Hamburgers
• Hot dogs
• Sandwiches
• Grilled meats
• Potato salad
• Tuna salad
• Meatloaf
• Roasted pork

Frequently Asked Questions

How much zucchini do I need to make zucchini relish?

You’ll need about 10 cups of chopped zucchini, which is approximately 3 to 4 medium zucchini weighing around 1.2 kg.

What is the shelf life of unopened homemade zucchini relish?

Properly canned and sealed zucchini relish lasts 12 to 18 months when stored in a cool, dark pantry.

Can I use white vinegar instead of apple cider vinegar?

Yes. White vinegar creates a sharper flavor, while apple cider vinegar provides a slightly milder and fruitier taste.

Do I need to peel the zucchini?

Young zucchini do not need to be peeled. If you’re using larger zucchini with thick, tough skin, it’s best to peel them before chopping.

Why did my zucchini relish turn mushy?

Mushy relish is usually caused by skipping the salt-soaking step or overcooking the vegetables. Salting and thoroughly draining the vegetables before cooking helps maintain a crisp texture.

Can I freeze zucchini relish instead of canning it?

Yes. Freeze zucchini relish in freezer-safe containers for up to 6 months, leaving room for expansion. Thaw it overnight in the refrigerator before serving.

If you need more zucchini ideas, try these Italian-Inspired Zucchini Garlic Bites or Healthy Carrot Zucchini Muffins.

Conclusion

I love making zucchini relish because it’s one of the easiest and most rewarding ways to preserve a bumper crop of summer squash. With its perfect balance of sweet, tangy, and savory flavors, this homemade relish adds a delicious burst of flavor to burgers, hot dogs, sandwiches, grilled meats, and salads. The key to success is taking the time to salt and drain the vegetables properly, which helps create a crisp, flavorful relish instead of a watery one. Whether you refrigerate, freeze, or can it for long-term storage, you’ll have a versatile homemade condiment ready whenever you need it.