15 hours to make a potato?
15 hours to make a potato? is a medium British recipe that serves 4. 700 calories per serving. Recipe by Poppy Cooks on YouTube.
Prep: 45 min | Cook: 3 hrs 5 min | Total: 4 hrs 20 min
Cost: $334.47 total, $83.62 per serving
Ingredients
- 2.5 kg Starchy Potatoes (large, high‑starch (e.g., Russet), peeled and sliced thin)
- 600 ml Double Cream (full‑fat, for richness)
- 6 Garlic Cloves (smashed to infuse the cream)
- 2 tbsp Flaky Sea Salt (generously seasoned)
- 1 tbsp Black Pepper (freshly ground, heavily seasoned)
- 1 Greaseproof Paper (to cover the tray during baking)
- 2 L Vegetable Oil (for deep‑frying, neutral flavor, high smoke point)
Instructions
Slice the Potatoes
Peel the potatoes, then slice them super‑thin (about 1‑2 mm) using a mandolin. Immediately place the slices in a bowl of cold water to prevent oxidation.
Time: PT15M
Infuse the Cream with Garlic
Combine the 600 ml double cream and the smashed garlic cloves in a saucepan. Heat over medium until just below a boil, allowing the garlic flavor to infuse, then remove the garlic pieces.
Time: PT10M
Temperature: just below boil
Season the Cream
Add the flaky sea salt and freshly ground black pepper to the warm cream, stirring until fully incorporated.
Time: PT2M
Layer the Potatoes
Drain the potato slices and pat them dry with a kitchen towel. On a clean tray, layer the slices one by one, pouring a little of the seasoned cream over each layer to keep them moist. Continue until the tray is full.
Time: PT15M
Cover and Bake Low and Slow
Lay a sheet of greaseproof paper on top of the layered potatoes, then place a heavy weight (e.g., a cast‑iron skillet) on top. Bake in a pre‑heated oven at 120°C for 3 hours.
Time: PT3H
Temperature: 120°C
Cool and Refrigerate Overnight
Remove the weight and let the slab cool to room temperature, then cover and refrigerate for at least 12 hours (overnight) to fully set.
Time: PT12H
Trim and Cut into Slabs
Take the chilled slab out of the tray, peel off the greaseproof paper, trim the edges to form a perfect rectangle, and cut into individual serving slabs.
Time: PT10M
Deep‑Fry the Slabs
Heat the vegetable oil in a deep‑fry pot to 190°C. Fry each slab for 2‑3 minutes, turning once, until the exterior is golden and crisp all around.
Time: PT5M
Temperature: 190°C
Drain and Serve
Using tongs, lift the fried slabs onto paper towels to drain excess oil. Serve immediately while hot and crispy.
Time: PT5M
Nutrition Facts
- Calories
- 700
- Protein
- 5 g
- Carbohydrates
- 50 g
- Fat
- 45 g
- Fiber
- 5 g
Dietary info: Vegetarian, Gluten-Free, High-Fat
Allergens: Dairy
Ingredient Substitutions
- Instead of Starchy Potatoes: Yukon Gold potatoes
- Instead of Double Cream: Heavy cream
- Instead of Garlic Cloves: Garlic powder (1 tsp)
- Instead of Flaky Sea Salt: Kosher salt
- Instead of Black Pepper: White pepper
- Instead of Greaseproof Paper: Parchment paper
- Instead of Vegetable Oil: Canola oil, Peanut oil
Equipment Needed
- Mandolin Slicer
- Large Mixing Bowl
- Saucepan
- Baking Tray
- Heavy Weight (e.g., cast‑iron skillet)
- Oven
- Refrigerator
- Deep‑Fry Pot or Heavy Pot
- Thermometer
- Tongs
- Kitchen Towel
- Sharp Knife
Critical Steps — Do Not Skip
- Slice the potatoes thinly to ensure even cooking
- Infuse the cream with garlic without boiling
- Layer potatoes with cream to create a uniform slab
- Bake at low temperature for 3 hours to set the structure
- Deep‑fry at the correct oil temperature for a crisp exterior
Chef Tips from the Video
- Soak sliced potatoes in cold water for at least 10 minutes to remove excess starch and keep them white.
- Use a heavy cast‑iron skillet as the weight for even pressure during baking.
- Pat the slab dry with paper towels before frying to reduce oil splatter.
Troubleshooting
The slab is soggy after baking.
Make sure the cream is reduced slightly before layering and that the potatoes are patted dry. Also, keep the oven temperature low and bake for the full 3 hours.
The slab falls apart when cutting.
Allow the slab to chill for the full overnight period; a firm, cold slab cuts cleanly. If still fragile, slice while still partially frozen.
Fried potatoes are greasy rather than crisp.
Maintain oil at 190°C; if the temperature drops, the coating will absorb oil. Fry in small batches and let the oil return to temperature between batches.
Storage
Refrigerator: Store leftovers in an airtight container for up to 2 days.
Freezer: Not recommended – the cream may separate when frozen.
Room temperature: Best enjoyed immediately; can sit out up to 1 hour before losing crispness.
Make-Ahead Tips
- The slab can be baked and refrigerated up to 24 hours ahead; simply fry just before serving.
- If you need to store longer, keep the baked slab wrapped tightly in plastic wrap to prevent drying out.
Frequently Asked Questions
What is the cultural significance and history of the 15‑Hour Potato in British cuisine?
While not a traditional British classic, the 15‑Hour Potato has become a modern comfort‑food icon on social media, showcasing the British love for indulgent potato dishes like mash, chips, and roast potatoes. Its viral status reflects the UK’s enthusiasm for creative, hearty side dishes that celebrate the humble potato.
What regional variations of slow‑cooked potato dishes exist in the United Kingdom?
In Scotland, slow‑cooked potatoes appear as “tattie scones” baked in a pan, while in Wales, layered potato casseroles with cheese are popular. The 15‑Hour Potato adapts the concept of low‑and‑slow cooking but adds a rich cream layer and a final deep‑fry for extra decadence.
How is the 15‑Hour Potato traditionally served in British households?
It is typically served as a luxurious side dish alongside roasted meats or as a centerpiece at casual gatherings. The golden, crispy exterior makes it perfect for sharing on a platter, often accompanied by a simple salad or gravy.
During which occasions is the 15‑Hour Potato most popular in the UK?
It’s a hit at weekend brunches, family game‑night gatherings, and festive occasions like Christmas or New Year’s when guests expect something extra indulgent and visually impressive.
What makes the 15‑Hour Potato special compared to other British potato dishes?
Its unique combination of ultra‑thin slices, garlic‑infused double cream, a 12‑hour chilling set, and a final high‑heat fry creates a texture contrast—creamy interior with a crunchy exterior—that few traditional dishes achieve.
What are the authentic traditional ingredients for the 15‑Hour Potato and acceptable substitutes?
The core ingredients are high‑starch potatoes, double (or heavy) cream, garlic, flaky sea salt, and black pepper. Substitutes include Yukon Gold potatoes for a slightly buttery flavor, heavy cream instead of double cream, and a neutral oil like canola for frying.
What other British dishes pair well with the 15‑Hour Potato?
It pairs beautifully with roast beef, lamb chops, or a classic Sunday roast. For a vegetarian spread, serve it alongside braised red cabbage, mushy peas, or a rich mushroom gravy.
What are the most common mistakes to avoid when making the 15‑Hour Potato?
Common errors include slicing the potatoes too thick, allowing the cream to boil, skipping the overnight chill, and frying at too low a temperature. Each mistake leads to uneven cooking, a soggy slab, or a greasy finish.
Why does this 15‑Hour Potato recipe use a low oven temperature of 120°C instead of a higher heat?
The low temperature gently cooks the thin potato layers and allows the cream to set without drying out, creating a cohesive slab that can be sliced cleanly. Higher heat would cause the cream to separate and the potatoes to become unevenly cooked.
What does the YouTube channel Poppy Cooks specialize in?
The YouTube channel Poppy Cooks specializes in approachable, comfort‑food recipes with a focus on creative twists for classic dishes, often featuring step‑by‑step tutorials and tips for home cooks of all skill levels.
How does the YouTube channel Poppy Cooks' approach to British comfort food differ from other cooking channels?
Poppy Cooks emphasizes practical shortcuts—like using a mandolin for ultra‑thin slices—and combines viral trends with traditional British flavors, delivering visually striking dishes that remain achievable in a home kitchen.
Last updated: August 31, 2026
