Japanese Kabocha Salad with Bacon & Sweet Onion

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Kabocha salad is a beloved staple of Japanese home cooking and deli culture. Walk through any grocery store deli section or department store food hall (depachika / デパ地下) in Japan, and you’ll almost certainly see vibrant, golden bowls of kabocha salad on display.

It’s sweet, comforting, and remarkably nutritious—a dish kids love as much as adults. Growing up, my grandma used to make kabocha salad whenever she wanted a break from making traditional potato salad.

If you’re new to working with this sweet Japanese squash, check out my guide on What is Kabocha Squash? to learn more about its flavor profile and nutritional benefits.

What is Kabocha Salad?

Unlike Western pumpkin dishes that lean heavily into sweet spices like cinnamon or nutmeg, Japanese kabocha salad treats the squash more like a potato. It balances the natural sweetness of the steamed squash with savory, tangy seasonings—usually Japanese mayonnaise, crisp onions, and often smoky bacon.

Every household in Japan has its own variation. Some like to fold in sliced apples or raisins for texture and fruitiness; others add salted, drained cucumber or hard-boiled eggs. In this recipe, I add a subtle dash of curry powder—you won’t explicitly taste “curry,” but it adds a warm, savory depth that ties the bacon and sweet onions together seamlessly.

Ingredients for Kabocha Salad

This recipe uses a simple combination of pantry staples and fresh ingredients to achieve the perfect balance of sweet, savory, and crunchy textures.

Key Ingredients & Substitutions

• Kabocha Squash: The star of the dish. Look for a squash with a dark green skin and deep orange flesh. Need prep tips? See my step-by-step guide on How to Cut and Store Kabocha Squash.
• Vidalia Onion (or Sweet Onion): Sweet onions add a clean, crisp crunch without the harsh sulfur bite of standard yellow onions. Salting and rinsing them ensures they don’t water down the salad.
• Bacon: Thick-cut bacon adds smoky, savory contrast. Pan-frying it until golden gives you crispy bits for the salad and rendered fat to fold into the mash for extra umami.
• Mayonnaise: Japanese mayonnaise (Kewpie) provides rich emulsification and a gentle acidity. For a living-ferment twist, try my homemade Koji Mayonnaise.
• Mild Curry Powder: Just 1/8 teaspoon acts as a secret flavor enhancer—it doesn’t make the salad taste like curry, but it rounds out the sweetness of the squash.
• Pumpkin Seeds (Pepitas): Toasted pumpkin seeds bring a nuttiness and satisfying crunch. Sliced almonds or chopped walnuts work wonderfully as well.
• Rice Vinegar & Milk: Rice vinegar brightens the sweet onions, while a splash of milk helps adjust the mash to your desired texture.

Optional Additions & Variations

• Vegetarian: Simply omit the bacon and rendered fat—the combination of sweet Vidalia onion, toasted seeds, and curry powder has plenty of depth on its own.
• Fruit & Crunchy Bites: Fold in paper-thin cucumber slices (salted and squeezed dry), diced Fuji apple, or raisins.
• Protein: Add chopped hard-boiled eggs for a richer, classic deli-style finish.

How to Make Kabocha Salad (Step-by-Step)

Step 1: Prep the Sweet Onion

Slice the Vidalia onion paper-thin on a mandoline. Transfer to a small bowl, sprinkle with a pinch of salt, and let sit for 5 minutes. This draws out excess water and sharp raw bite. Rinse 2 to 3 times in cold water, then squeeze out all moisture thoroughly in paper towels.

Step 2: Microwave Steam the Kabocha

Wash the kabocha exterior, trim off any thick, bumpy spots on the skin with a knife, and cut into large chunks. Place the chunks in a microwave-safe bowl and cover tightly with plastic wrap. Microwave at 600W/700W for 3 to 4 minutes. Let the bowl sit covered for 1 minute so the steam finishes cooking the squash. Carefully unwrap and test with a bamboo skewer—it should slide in effortlessly.

Step 3: Crisp the Bacon

While the squash is microwaving, cut the bacon strips into 2 to 3 cm pieces. Heat a skillet over medium heat and cook the bacon until crisp and golden brown. Remove the bacon bits and set aside, reserving the warm rendered fat in the pan.

Step 4: Mash & Combine Everything

In the bowl with the hot microwaved kabocha, add the prepared sweet onion, crispy bacon, mayonnaise, mild curry powder, rice vinegar, and toasted pumpkin seeds. Mash with a fork or potato masher to your liking—leaving plenty of rustic kabocha chunks is recommended for texture!

If you prefer a softer, smoother salad, stir in 1 tablespoon of milk. For an extra layer of savory depth, mix in 1 to 2 teaspoons of the warm rendered bacon fat. Season with sea salt and freshly cracked black pepper to taste.

Step 5: Chill

Cover the salad and refrigerate for at least 1 hour (or overnight). Chilling allows the starches to set and the flavors to meld into a cohesive, savory side dish.

How to Store Kabocha Salad

• In the Refrigerator: Store leftovers in an airtight container in the fridge for up to 3 to 4 days. The flavor actually improves after the first day as the ingredients rest together. Give it a gentle toss before serving chilled or at room temperature.
• Freezing Note: Freezing is not recommended for this salad. The mayonnaise can separate upon thawing, and the microwaved kabocha will release excess water, making the texture soggy.