Sweet Potato Tempura
Sweet Potato Tempura features naturally sweet slices covered in a delicate crispy batter.The outside becomes light and golden while the inside stays tender and creamy.A simple cold batter made with flour, egg, and ice water creates the classic texture.The sweet potato is fried quickly until crisp and lightly browned.Serve it with tentsuyu, soy sauce, or a pinch of sea salt.This easy Japanese-inspired dish makes a wonderful appetizer, snack, or side dish.
Ingredients
For the Sweet Potato
- 2 large sweet potatoes
- ½ teaspoon salt, optional
- Vegetable oil, for deep frying
For the Tempura Batter
- 1 cup all-purpose flour
- 1 large egg
- 1 cup ice-cold water
- 1 tablespoon cornstarch
- ½ teaspoon salt
For Serving
- Tentsuyu dipping sauce
- Soy sauce
- Grated daikon, optional
- Fresh ginger, grated
- Toasted sesame seeds
- Lemon wedges, optional
Instructions
Prepare the Sweet Potatoes
- Wash and scrub the sweet potatoes thoroughly.You can peel them or leave the skin on after washing, depending on your preference.Leaving the skin on provides additional texture and color.
Slice the Sweet Potatoes
- Cut the sweet potatoes into thin, even slices approximately ¼ inch (6 mm) thick.Long slices or diagonal slices work especially well.Try to keep the slices similar in thickness so they cook evenly.
Soak the Slices
- Place the sweet potato slices in a bowl of cold water.Soak for approximately 5–10 minutes.This helps remove some surface starch.Drain the slices thoroughly.
Dry Thoroughly
- Pat the sweet potato slices completely dry with clean kitchen towels or paper towels.This step is important because excess water can cause hot oil to splatter.
Heat the Oil
- Pour vegetable oil into a deep, heavy-bottomed pot or deep fryer.Heat the oil to approximately 350°F–360°F (175°C–180°C).Use a kitchen thermometer for the most reliable results.
Prepare the Batter
- Place the flour and cornstarch in a bowl.In a separate bowl, lightly beat the egg.Add the ice-cold water to the egg and mix gently.Pour the liquid into the flour mixture.
Mix Lightly
- Use chopsticks, a fork, or a whisk to mix the batter briefly.Do not overmix.A few small lumps of flour are perfectly acceptable and can actually help create a lighter tempura texture.
Coat the Sweet Potato
- Dip each dried sweet potato slice into the batter.Allow excess batter to drip off briefly.The sweet potato should have a thin coating rather than a thick layer.
Fry the Tempura
- Carefully place the battered sweet potato slices into the hot oil.Do not overcrowd the pot.Fry in batches for approximately 2–4 minutes per side, depending on the thickness of the slices.
Check for Doneness
- The tempura should become lightly golden and crisp.The sweet potato should be tender when pierced with a skewer or fork.If the batter browns too quickly before the sweet potato becomes tender, reduce the oil temperature slightly.
Drain
- Remove the cooked tempura using a slotted spoon or wire skimmer.Place the pieces on a wire rack to drain.Avoid stacking them on paper towels because trapped steam can soften the crispy coating.
Season and Serve
- Lightly sprinkle with sea salt if desired.Serve immediately with warm or room-temperature tentsuyu dipping sauce.Add grated daikon and ginger for a classic Japanese-inspired presentation.
Notes
- Slice evenly: Uniform slices cook more consistently.
- Dry the potatoes: Excess moisture can cause oil splattering and prevent the batter from adhering properly.
- Use cold water: Ice-cold water helps create a lighter tempura batter.
- Don't overmix: Overmixing develops gluten and can make the batter heavy.
- Maintain oil temperature: A consistent temperature helps produce crisp tempura.
- Avoid overcrowding: Too many pieces can lower the oil temperature.
- Use a wire rack: This allows excess oil to drain while preserving crispness.
- Serve immediately: Tempura is crispiest when eaten soon after frying.