This post may contain affiliate links, please see the privacy policy for details.
Homemade cocktail onions are tangy, crisp and so simple to make, using just a handful of ingredients. These quick pickled pearl onions are perfect for adding a punch of flavor to cocktails, charcuterie boards or appetizers. With subtle spice from mustard seed and peppercorns and a balanced vinegar brine, they taste fresh and delicious. This is a great make-ahead recipe, and the onions only get better after a day or two in the fridge. Try these and you’ll never want the store-bought kind again.
Cocktail onions are easy to make at home. They offer crispness and a perfect tangy flavor. Perfect in martinis, charcuterie boards or as a snack straight from the jar.
You might also like pickled green beans, pickled banana peppers, pickled carrots and pickled cauliflower.
Why You’ll Love It
Simple ingredients: You probably have most of them already.
Perfect for entertaining: Great in cocktails, snacks or charcuterie.
Quick prep: Only a few minutes of cooking and chill time does the rest.
Great texture: These stay crisp and flavorful in the brine.
Pickled Cocktail Onions Ingredients
A complete list of ingredients and amounts can be found in the recipe card below.
Fresh pearl onions: Small onions with natural sweetness that hold their shape and absorb flavor. You can find them at most grocery stores in the onions and garlic aisle. Choose firm ones, avoiding any with blemishes or soft areas.
Mustard seed: Adds a warm, sharp spice to the brine.
Peppercorns: Bring subtle heat and depth to the mix.
Red pepper flakes: Optional, for a mild spicy kick.
Bay leaf: Adds herbal flavor to round out the vinegar base.
Vinegar: White distilled vinegar and apple cider vinegar create a sharp but slightly sweet brine.
Granulated sugar: Balances the acidity of the vinegar.
Kosher salt: Enhances the flavor of the onions and brine.
How to Make Cocktail Onions
For more detailed instructions with weights and measurements, jump to the printable recipe card.
Blanch the onions: Soak in boiling water, then transfer to ice water and peel.
Add to the jar: Combine peeled onions with mustard seed, peppercorns, red pepper flakes and bay leaf in a glass mason jar (these are perfect!)
Make the brine: Simmer vinegar, water, sugar and salt until dissolved.
Pour the brine: Carefully pour hot brine over the onions in the jar until filled.
Seal and chill: Cover, refrigerate and let sit for at least 24 hours. Shake before using.
Substitutions and Variations
Use white wine vinegar: Swap both vinegars for white wine vinegar for a lighter taste.
Add herbs: Try a sprig of fresh thyme, rosemary or tarragon for added depth.
Add pickling spices: Fennel seeds, coriander, star anise or allspice give a complex twist.
Make it spicier: The recipe calls for mustard seed and optional red pepper flakes already but you can add extra red pepper flakes or a slice of fresh chili for extra heat if you want to.
Serving Suggestions
With a charcuterie board: Enjoy them with your next charcuterie board, butter board or cheese platter.
With a burger: Enjoy cocktail onions with a gorgonzola buffalo burger or cheeseburger tacos.
With a cocktail: Make them a signature garnish on a Canadian Caesar cocktail, martini, Bloody Mary or other drinks.
With eggs: Finely chop them and add to your next deviled eggs or egg salad.
You can gift them too: Know someone who’d love to receive homemade pickled onions? Make extra and make a cute label to go on the jar.
How to Store Cocktail Onions
Store: Keep them in the jar in the refrigerator and eat within 2 months.
Freeze: I don’t recommend freezing them, as they may thaw out mushy.
Top Tips
Use fresh pearl onions: Frozen ones tend to lose their crunch and the onions are the main ingredient in this pickled onions recipe.
Blanch first: A quick boil and ice bath makes peeling much easier and gives them time to cool.
Let them sit: A full day in the fridge helps develop the best flavor. They’re even better after two or three days.
Always use clean utensils: This prevents contamination and keeps them fresh longer.
Pickled Cocktail Onions FAQs
Yes, peeling helps the brine soak in and gives a better texture.
You can reduce it, but it helps balance the acidity of the vinegar.
Not unless you follow proper canning methods. This is a refrigerator pickle. If you want to use this recipe for canning, follow USDA guidelines for a water bath and canning.
Easy Cocktail Onion Recipe
Cocktail Onions
Equipment
- Saucepan Large
- Slotted Spoon or Strainer
Ingredients
- 16 Ounces pearl onions, peeled
- 1 Teaspoon mustard seed
- 1 Teaspoon peppercorns
- ¼ Teaspoon red pepper flakes, optional
- 1 bay leaf, dried
- ½ Cup water
- ¼ Cup white vinegar, distilled
- ¼ Cup apple cider vinegar
- ¼ Cup granulated sugar
- 1 Tablespoon kosher salt
Instructions
- Peel onions by soaking them in boiling water for 60 seconds.
- Cool in cold water or ice bath, drain and peel.
- Place peeled onions, mustard seed, peppercorns, red pepper flakes, and bay leaf in a 17-ounce mason jar.
- Whisk together water, white vinegar, apple cider vinegar, sugar, and salt in a large saucepan.
- Bring to a low boil and simmer for 5 minutes.
- Carefully pour vinegar mixture over onions.
- Seal with lid and store in the refrigerator for at least 24 hours.
- Shake mixture before serving.
Notes
Blanch first: A quick boil and ice bath makes peeling much easier and gives them time to cool.
Let them sit: A full day in the fridge helps develop the best flavor. They’re even better after two or three days.
Always use clean utensils: This prevents contamination and keeps them fresh longer.
Nutrition
Cocktail onions are easy to make and incredibly versatile. Their crisp texture and punchy flavor make them a great addition to cocktails, meat and cheese boards or appetizers. This quick pickled version comes together fast and keeps well in the fridge. Once you try a pickled sweet onion, the store-bought kind just won’t cut it!
Other Recipes to Try
Bella Bucchiotti
Bella Bucchiotti is a Canadian-based syndicated food, travel, and lifestyle writer, photographer, and creator at xoxoBella. She founded xoxoBella in 2015, where she shares her love for food, dogs, sustainability, fitness, crafts, outdoor adventures, travel, and philanthropy to encourage others to run the extra mile, try new recipes, visit unfamiliar places, and stand for a cause. Bella creates stress-free and family-friendly recipes for weeknight dinners and festive feasts.
