Sweet Potato Ukoy Recipe: Crispy Celery Crown Over Creamy Cheese Bliss

This sweet potato ukoy recipe transforms humble ingredients into a crispy, golden crown of celery and sweet potatoes, perfectly balanced with creamy cheese and tangy-savory flavors. 💛 The secret lies in the delicate interplay of textures—crispy on the outside, tender within—and a sauce that harmonizes sweetness with vinegar's bright acidity.

I developed this vegetarian adaptation after discovering how Filipino comfort food thrives on simple, well-executed techniques. What makes this dish special is its dual personality: the crispy celery crown (ukoy) provides satisfying crunch, while the creamy cheese filling delivers rich, velvety comfort.

The sweet potatoes add natural sweetness that plays beautifully against the tangy vinegar and savory soy sauce. This recipe captures the soul of Filipino home cooking without relying on meat, proving how vibrant plant-based dishes can be.

By the time you serve this dish, you'll have a plate that's visually stunning with its golden crown and creamy base, while delivering complex flavors in every bite. The crispy celery and sweet potato slices hold their shape beautifully, creating that satisfying contrast with the soft, melty cheese center.

It's the kind of dish that feels indulgent yet remains light enough for a weeknight dinner. Perfect as a vegetarian main course or hearty side dish, this ukoy recipe scales easily for gatherings. The key is patience in achieving that perfect crispiness while keeping the cheese filling perfectly creamy.

Let's get cooking!

Ingredients for sweet potato ukoy

These vibrant ingredients create a delicate balance of crispy, creamy textures and tangy-savory flavors.

The sweet potatoes and celery are the stars here—look for vibrant orange sweet potatoes with smooth skin at Whole Foods or your local Asian market (they often carry the perfect variety). The celery should be firm and crisp, with thick stalks that hold their shape during frying. For the cheese, Kraft 2% or Sargento brands provide consistent melt and shred well. Pre-shredded cheese works here, but avoid the kind with anti-caking agents—it burns easily. The cornstarch is non-negotiable for that signature ukoy crispiness, so don't skip it even if you're in a hurry. If you can't find canola oil, vegetable or peanut oil works just as well for frying.

No sharp cheddar? Parmesan mixed with mild cheddar at a 1:3 ratio gives similar depth. Running short on vinegar? Lemon juice or rice vinegar work in a pinch, though white vinegar's clean tang is ideal. The garlic can be jarred minced if fresh isn't available, but toast it first in the oil for 30 seconds to deepen the flavor. For a lower-carb version, use cauliflower rice mixed with sweet potato—just reduce the moisture slightly. The soy sauce matters here; Kikkoman or Lee Kum Kee brands provide that authentic Filipino umami punch. If you're gluten-sensitive, swap the flour for gluten-free all-purpose blend—just add an extra tablespoon for better binding.

Store prepped sweet potato and celery slices in airtight containers with paper towels between layers for up to 2 days before frying. The cheese mixture keeps well for 3 days in the fridge, covered tightly. For make-ahead convenience, fry the crown components 1 day ahead and reheat in a 350°F oven for 5-7 minutes until crispy again. The sauce can be made 3 days ahead and stored in a jar—its flavors actually improve over time. To reheat the whole dish, cover with foil and warm at 325°F for 10-12 minutes, then crisp under the broiler for 2 minutes. Freeze the crown components separately on parchment-lined trays before transferring to bags for 1 month—just reheat from frozen in the oven.

Step-by-step instructions for sweet potato ukoy

Transform humble sweet potatoes into golden, crispy ukoy with a creamy cheese center.

In a large bowl, combine the 1.5 lb orange sweet potatoes (already sliced into ¼-inch rounds) with the 1 bunch celery stalks (trimmed into ¼-inch strips). This creates your crispy crown foundation. In a separate bowl, whisk together the ¼ cup all-purpose flour, 2 tbsp cornstarch, 1.5 tsp salt, and ½ tsp black pepper. The cornstarch is crucial—it gives that signature ukoy crunch.

Dredge each sweet potato and celery piece in the flour mixture, pressing gently to adhere. Shake off excess but don't worry about perfection—some flour clinging is fine. Arrange the coated pieces on a parchment-lined baking sheet in a single layer, leaving ½-inch gaps between them. This prevents steaming and ensures maximum crispiness when fried.

Fill a deep fryer or heavy pot with 3 cups canola oil and heat to 350°F—use a thermometer for precision. The oil should shimmer but not smoke. Working in batches (don't overcrowd!), carefully lower the sweet potato and celery pieces into the oil. Fry for 3-4 minutes until they turn a deep golden brown with crisp edges. You'll see tiny bubbles forming around the pieces—that's your signal they're ready.

Use a slotted spoon to transfer the fried ukoy to a paper towel-lined plate. Let them drain for 2 minutes to remove excess oil, but don't press them down or they'll lose crispness. Keep the oil at 350°F for the next batch—consistent temperature is key to even cooking.

While the ukoy fries, prepare the cheese filling. In a small saucepan, combine ½ cup white vinegar, ¼ cup soy sauce, 2 tbsp granulated sugar, and the 3 minced garlic cloves. Bring to a gentle simmer over medium heat and cook for 3-4 minutes until slightly reduced and fragrant. This tangy-sweet sauce forms the base of your cheese mixture.

Remove from heat and stir in the 1.5 cups shredded mozzarella cheese and ½ cup extra-sharp cheddar cheese. The mixture should be thick but still pourable—if it's too stiff, add 1-2 teaspoons of hot water to loosen it. Let it cool slightly while you assemble the ukoy.

Preheat your oven to 375°F. Using a piping bag (or a plastic bag with a corner snipped off), pipe 1-2 tablespoons of the cheese mixture into the center of each fried sweet potato piece. The heat from the ukoy will help melt the cheese immediately, but the oven finish ensures everything is perfectly gooey.

Transfer the assembled ukoy to a baking sheet and bake for 5-7 minutes until the cheese is fully melted and bubbly. Watch closely—the cheese should be just about to brown at the edges, but still creamy inside. Serve immediately while the cheese is molten and the ukoy remains crisp.

Pro cooking tips for sweet potato ukoy

Double-Fry Secret

For that signature ukoy texture, I recommend a double-fry technique—fry once at 350°F for 2-3 minutes until soft, then increase oil to 375°F and fry again for 1-2 minutes until golden and crisp.

This two-step process creates the perfect contrast between tender sweet potatoes and crispy edges. Use a thermometer to monitor oil temps precisely—fluctuations ruin crispiness. 🔥

Cheese Melting Hack

To ensure the cheese stays perfectly creamy, mix 1 teaspoon of cornstarch directly into the shredded cheese before adding it to the sauce. This prevents the cheese from becoming stringy when melted.

I also like to add 1 teaspoon of baking powder to the cheese mixture—it creates tiny air pockets that make the filling extra light and fluffy. 💫

Oil Temperature Control

Never skip the thermometer—oil that's too cool makes soggy ukoy, while oil that's too hot burns the outside before the inside cooks. Maintain 350°F for initial frying and 375°F for the crisping stage.

If you don't have a thermometer, use the cold spoon test: drop a wooden spoon into the oil—if bubbles form around it immediately, the oil is ready. 🌡️

Batch Management

Work in small batches—overcrowding the fryer lowers oil temperature and steams the ukoy instead of crisping it. I fry no more than 12 pieces at a time in a 3-quart deep fryer.

Keep the fried ukoy in a 200°F oven while you finish the remaining batches—this maintains crispness while you assemble. A wire rack on a baking sheet works perfectly for this. ⏰

Sauce Reduction Timing

Reduce the sauce until it coats the back of a spoon—this ensures it clings perfectly to the cheese. Simmer for exactly 3-4 minutes over medium heat (never high heat or it burns).

The sugar should dissolve completely, and you should smell the garlic deeply. Let the sauce cool for 5 minutes before mixing with cheese to prevent premature melting. 💡

Assembly Temperature

Assemble the ukoy while the cheese mixture is still warm but not molten—this gives you time to pipe it neatly without it sliding out. If the cheese cools too much, warm it gently in the microwave for 10 seconds before piping.

For extra stability, chill the cheese mixture in the fridge for 10 minutes before piping—it holds its shape better when cold. 🧊

Frequently asked questions