Bonger Potatoes with Caramelized Onions
Bonger Potatoes with Caramelized Onions is a medium French recipe that serves 4. 270 calories per serving. Recipe by Ben Goshawk on YouTube.
Prep: 20 min | Cook: 1 hr 40 min | Total: 2 hrs 15 min
Cost: $3.40 total, $0.85 per serving
Ingredients
- 2 medium Onion (sliced, skins removed; halves saved for stock and layering)
- 25 g Unsalted Butter (cold, cut into a small knob)
- 30 ml Water (shot of water for deglazing the onions)
- 750 ml Water (for the stock base)
- 2 cubes Chicken Stock Cubes (low‑sodium if possible)
- 1 tablespoon Fresh Thyme (leaves only; stems saved for stock)
- 1.2 kg Russet Potatoes (peeled (optional) and thinly sliced)
- to taste Salt (for seasoning each layer)
- to taste Black Pepper (freshly cracked for each layer)
Instructions
Slice and Save Onion Trim
Halve the onions, peel the outer layers, slice them into medium‑thick pieces, then set aside half of the sliced onions for later layering and reserve the skins and root ends as trim for the stock.
Time: PT5M
Caramelize Onions
Add the 25 g butter to the cold frying pan, then add the sliced onions, a pinch of salt, and a shot (30 ml) of water. Cover with a lid and heat on high for 5 minutes, then uncover and continue cooking on low, stirring occasionally, until the onions are deep golden‑brown and fragrant (about 20 minutes total).
Time: PT25M
Prepare Light Chicken Stock
In a saucepan combine 750 ml water, the 2 chicken stock cubes, the saved onion trim, and the thyme stems. Bring to a gentle simmer for 5‑7 minutes to extract flavor, then remove from heat and set aside.
Time: PT7M
Slice Potatoes Thinly
Peel the russet potatoes (or leave skins on if desired) and slice them on a mandolin to the thickness of a poker chip (≈2 mm). Work quickly to prevent oxidation.
Time: PT10M
Assemble the Layers
In the baking dish, spread half of the caramelized onions to form a base. Drizzle a little of the infused stock over them. Layer half of the potato slices, sprinkle with thyme leaves, salt, pepper, and ladle a few spoonfuls of stock. Repeat the potato‑thyme‑seasoning‑stock layers. Add the remaining caramelized onions as the third layer, then finish with a final potato layer, seasoning, and a gentle press to settle the slices. Add a final splash of stock so the top is just barely covered.
Time: PT10M
First Bake
Place the dish in a pre‑heated oven at 165 °C (no higher than 180 °C) and bake for 30 minutes.
Time: PT30M
Temperature: 165°C
Press and Continue Baking
Remove the dish, press the potatoes gently with a fork or press to bring stock to the surface, add a little more stock if the dish looks dry, then return to the oven. Continue baking, pressing every 15 minutes, until the potatoes are tender and the top is golden (about 45 minutes more).
Time: PT45M
Temperature: 165°C
Rest and Serve
Remove from oven, let rest for 5 minutes before slicing and serving.
Time: PT5M
Nutrition Facts
- Calories
- 270
- Protein
- 4 g
- Carbohydrates
- 50 g
- Fat
- 5 g
- Fiber
- 4 g
Dietary info: Contains meat stock
Allergens: Dairy
Ingredient Substitutions
- Instead of Unsalted Butter: Margarine
- Instead of Chicken Stock Cubes: Vegetable stock cube
- Instead of Fresh Thyme: Dried thyme (½ tsp)
- Instead of Russet Potatoes: Yukon Gold potatoes
Equipment Needed
- Cold Frying Pan
- Saucepan
- Mixing Bowl
- Mandolin
- Ovenproof Baking Dish
- Fork or Potato Press (optional)
- Oven
- Kitchen Towel (optional)
Critical Steps — Do Not Skip
- Using a shot of water and a lid to speed up the initial caramelization of onions.
- Layering potatoes evenly and pressing during baking to avoid uneven cooking.
- Maintaining a gentle oven temperature (160‑170 °C) to keep the dish moist.
Chef Tips from the Video
- Use fresh thyme leaves for brightness; dried thyme can be added earlier in the stock.
- A light drizzle of olive oil over the final layer adds a subtle sheen without adding much fat.
- For extra flavor, finish with a sprinkle of grated Gruyère cheese (optional).
Troubleshooting
Top layer dries out before the center is tender.
Cover loosely with foil and add a few extra tablespoons of stock; lower oven temperature to 160 °C.
Potato slices are unevenly cooked, with hard spots.
Ensure slices are uniform (≈2 mm) and press gently during baking to eliminate air pockets.
Onions burn during caramelization.
Add a splash of water and keep the lid on for the first 5 minutes; stir frequently.
Storage
Refrigerator: Store in an airtight container for up to 3 days; reheat gently in the oven.
Freezer: Not recommended, texture may become mushy.
Room temperature: Do not leave at room temperature for more than 2 hours.
Make-Ahead Tips
- Assemble the layered dish up to step 5, cover tightly, and refrigerate up to 24 hours before baking.
- If making ahead, add an extra splash of stock before the final bake to compensate for moisture loss.
Frequently Asked Questions
What is the cultural significance and history of Bonger Potatoes with Caramelized Onions in French home cooking?
Bonger potatoes are a classic French gratin technique that emphasizes thinly sliced potatoes layered with aromatics and a light broth. Historically, French chefs used this method to create elegant, low‑fat side dishes that showcase the natural flavor of potatoes while keeping the dish moist and tender.
What are the traditional regional variations of potato gratin in French cuisine?
In Provence, gratins often include herbs like thyme and rosemary and a splash of olive oil. In the Alpine regions, cheese such as Gruyère or Emmental is added for richness. The Bonger style focuses on a light stock and minimal fat, differing from the richer Dauphinoise version.
How is Bonger Potatoes with Caramelized Onions traditionally served in French households?
It is typically served as a side dish alongside roasted meats, poultry, or fish. The gratin is presented hot from the oven, often garnished with fresh thyme leaves and a light drizzle of olive oil.
What occasions or celebrations is Bonger Potatoes with Caramelized Onions traditionally associated with in French cuisine?
While not tied to a specific holiday, this dish appears frequently at family Sunday lunches, holiday feasts, and dinner parties where a refined yet comforting side is desired.
What makes Bonger Potatoes with Caramelized Onions special or unique in French cuisine?
The use of a thin water‑enhanced caramelization step and a light chicken‑stock broth keeps the dish low in fat while delivering deep, savory flavor. The careful layering and periodic pressing create a cohesive, melt‑in‑your‑mouth texture that differs from denser gratins.
What are the most common mistakes to avoid when making Bonger Potatoes with Caramelized Onions?
Common errors include over‑cooking the onions without the water shortcut, using uneven potato slices, and adding too much stock which makes the gratin soggy. Press the layers gently during baking and keep the oven temperature moderate to ensure even cooking.
Why does this Bonger Potatoes recipe use a shot of water and a lid for the first stage of onion caramelization instead of traditional dry sauté?
The water creates steam that quickly softens the onions, shortening the wilting stage from 20‑30 minutes to about 5 minutes. The lid traps the steam, allowing the onions to become tender without burning, then the water evaporates, letting the sugars brown later.
Can I make Bonger Potatoes with Caramelized Onions ahead of time and how should I store them?
Yes. Assemble the dish up to the layering step, cover tightly, and refrigerate for up to 24 hours. When ready, add a splash of extra stock and bake as directed. The dish reheats well, but avoid freezing as the texture may become mushy.
What texture and appearance should I look for when Bonger Potatoes with Caramelized Onions is done cooking?
The top should be a golden‑brown crust with a slight crisp, while the interior potatoes are tender and the layers hold together when sliced. A gentle steam should rise when you press the top, indicating the stock has been absorbed.
What does the YouTube channel Ben Goshawk specialize in?
The YouTube channel Ben Goshawk focuses on practical home‑cooking techniques, emphasizing flavor‑forward dishes that use minimal fat and clever shortcuts to achieve restaurant‑quality results.
How does the YouTube channel Ben Goshawk's approach to French cooking differ from other French cooking channels?
Ben Goshawk blends classic French flavor foundations with modern, low‑fat methods and clear step‑by‑step explanations, whereas many French channels prioritize traditional butter‑rich preparations. His videos often highlight time‑saving tricks like the water‑lid onion technique.
Last updated: August 21, 2026
