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Spring Fennel Polish Éclairs with Sourdough Starter

Airy, light éclairs filled with pastel fennel cream, subtly sweetened and brightened for a sugar-free spring treat.

Total: 1 hour 30 minutes
Difficulty: Easy
Serves: 8
sugar-free spring pastel sourdough Polish easy sugarfree sourdough-starter quick-&-simple

What Makes This Special

Celebrate spring with light-as-air Polish éclairs, naturally leavened using sourdough starter for a subtle tang and extra lift. The filling features fresh, crisp fennel—a star spring ingredient—blended into a creamy, sugar-free pastel filling. These éclairs are easy, fuss-free, and bring authentic Polish flair to your seasonal table—all without refined sugar!

Ingredients

Spring is about renewal and brightness, and these éclairs embody that spirit. The sourdough starter aerates the choux, while fresh fennel adds an aromatic, anise-like twist to the traditional Polish cream. Erythritol brings gentle sweetness without sugar. Finish with pastel glaze for a whimsical, festive look.

For the Sourdough Choux Pastry

  • Sourdough Starter: Adds rise and subtle flavor; must be active and bubbly.
  • Water: Hydrates the dough, helps drive steam for puffing.
  • Butter: Richness and flavor; creates tender choux.
  • Flour: Structure; use plain/all-purpose.
  • Salt: Enhances flavor.
  • Eggs: Essential for puff, structure, and golden color.
  • Vanilla: For subtle aroma.

For the Fennel Cream Filling

  • Double Cream & Mascarpone: Classic Polish cream base—rich but light.
  • Powdered Erythritol: Sugar-free sweetness (see notes for alternatives).
  • Fennel Bulb & Fronds: Fresh, crisp flavor and color.
  • Lemon Zest: Brightness and freshness.
  • Pastel Color: Optional, for a spring look.

For the Pastel Glaze

  • Powdered Erythritol or Xylitol, water, natural color (see instructions).

Instructions

Step 1: Prepare Your Sourdough Starter

Ensure your starter is active: feed it 4-8 hours ahead with equal parts flour and water. It’s ready when doubled, bubbly, and floats in water. This boosts rise and adds delicate flavor.

Step 2: Make the Sourdough Choux Pastry

  1. Preheat oven to 200°C. Line a baking tray with parchment.
  2. In a medium saucepan, combine water, butter, and salt. Bring to a simmer over medium heat.
  3. Once the butter melts, add flour all at once. Stir vigorously with a wooden spoon for 2-3 minutes. The dough should form a ball and a thin film on the pan.
  4. Remove from heat. Cool for 5-7 minutes until just warm (not hot to touch).
  5. Stir in the sourdough starter until fully incorporated.
  6. Beat in eggs one at a time, mixing well after each. The dough should be glossy, smooth, and pipeable (forms a thick ribbon).
  7. Stir in vanilla extract.

Step 3: Pipe & Bake the Éclairs

  1. Transfer dough to a piping bag fitted with a large round or star tip.
  2. Pipe 8 oblong shapes (10cm long, 2cm wide) onto tray, spacing well.
  3. Smooth tips with a damp finger if needed.
  4. (Optional) Lightly mist with water for extra puff.
  5. Bake at 200°C for 15 minutes, then lower to 180°C and bake 15-20 minutes longer—until puffed, golden, and crisp.
  6. Turn off oven, prop door open, and leave shells inside for 10 minutes to dry (prevents collapse).

Step 4: Prepare the Fennel Cream Filling

  1. In a small bowl, whisk mascarpone, double cream, and powdered erythritol until soft peaks form.
  2. Fold in finely diced fennel bulb, fennel fronds, lemon zest, and food coloring (if using) for pastel hue. Mix gently—cream should be thick but pipeable.
  3. Chill until ready to fill.

Step 5: Assemble the Éclairs

  1. Once shells are cool, use a small knife to cut a slit on the side or underside.
  2. Pipe fennel cream generously inside each éclair.

Step 6: Make the Pastel Glaze

  1. Sift 40g powdered erythritol or xylitol into a bowl.
  2. Stir in 1–2 tsp water, drop by drop, until a thick, spreadable icing forms.
  3. Add a drop of pastel food coloring (optional).
  4. Spread over éclairs and garnish with fennel fronds.

Pro Tips

  • Sourdough Starter: Use bubbly, active starter for the best lift—flat starter won’t aerate the choux. If your starter is sluggish, feed it again to revive.
  • Eggs: Add eggs gradually—dough should be glossy and pipeable, but not runny. You may need a little more or less egg depending on flour absorption.
  • Fennel: Dice the fennel finely for best texture and appearance in cream.

Troubleshooting

Flat éclairs? Your oven may not have been hot enough, or the eggs were under-mixed. Always preheat thoroughly and check dough consistency.

Cream too runny? Over-whipped, or mascarpone too warm. Chill both cream and mascarpone well before whipping and stop at soft peaks.

Variations

  • Herbaceous Twist: Add fresh tarragon or dill with fennel for a more herbal note.
  • Citrus Fennel: Substitute lime or orange zest for lemon.
  • Traditional Cream: Use vanilla bean instead of fennel for a classic Polish touch.

Storage

Best enjoyed the day they’re made. Store assembled éclairs in an airtight container in the fridge for up to 2 days. Shells (unfilled) keep 2–3 days at room temp or can be frozen for up to 1 month.

Sourdough Choux—A Polish Spring Favorite

Incorporating sourdough starter is a classic Polish technique, giving these éclairs a unique tang and delicate springy texture. With fresh fennel and a sugar-free pastel glaze, they’re the perfect light, seasonal treat. Enjoy the process, embrace the season, and share with friends!