Radish and Cultured Butter Tartine (French Open Sandwich)
Why this recipe works
- Crisp and creamy contrast: Warm, crunchy toast gives structure to the soft cultured butter and thin, crisp radish slices.
- Brightened richness: Lemon zest and juice cut through the butter, keeping the tartine fresh rather than heavy.
- Ready in minutes: With no cooking beyond toasting the bread, the recipe comes together quickly and depends on good assembly rather than technique.
Get the most out of this recipe
Ingredient notes
- Use good cultured butter: Cultured butter brings a gentle tang that works especially well with radish and lemon; softened butter spreads cleanly without tearing the toast.
- Choose firm radishes: Fresh, firm radishes give the best crunch and a cleaner peppery bite. Avoid any that feel soft or spongy.
- Add lemon gradually: A small amount of lemon lifts the butter, but too much can make it loose. Add just enough for brightness.
Texture tips
- Toast the bread deeply: A well-toasted slice holds up better under the butter and radishes, especially once the lemon is added.
- Slice the radishes thinly: Thin slices sit neatly on the butter and make the tartine easier to bite through without dragging the topping off.
Timing notes
- Serve straight after assembling: This tartine is at its best while the toast is still warm and crisp, before the butter fully melts into the bread.
Make-ahead tips
- Prep components separately: The butter and sliced radishes can be kept separately in the fridge, then assembled on freshly toasted bread just before serving.
- Avoid early assembly: Assembling in advance softens the toast and dulls the contrast between the crisp bread, creamy butter and fresh radish.
Equipment you'll need
Ingredients
Instructions
- Toast the sourdough until deeply golden and crisp at the edges. While it toasts, thinly slice the radishes and finely zest the lemon.
- In a small bowl, mix the cultured butter with a little lemon zest and a squeeze of lemon juice until bright and spreadable. Taste and adjust with a pinch of fine sea salt if you like.
- Spread the lemony butter generously over the warm toast. Top with the sliced radishes, then finish with the remaining fine sea salt and cracked black pepper. Serve immediately while the toast is still warm and crisp.
Recipe notes
Tips
- For the best texture, slice the radishes as thinly as you can so they sit neatly on the butter and are easy to bite through.
- If your butter is very cold, spread it on the hot toast first, then add the lemon zest and juice directly on top and swirl it in with the back of a spoon.
Substitutions
- Replace sourdough bread with country bread for a slightly softer crumb and milder tang.
- Replace cultured butter with unsalted butter for a cleaner, less tangy flavour.
Storage
- Refrigerate up to 1 days
- This tartine is best eaten straight away. If needed, store sliced radishes and the butter separately in the fridge, then toast fresh bread and assemble just before serving.
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Recipe overview
- Servings: 2 servings
- Total time: 10min (10min active)
- Difficulty: Easy
- Cuisine: French
-
Allergens:
Gluten Milk Wheat
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