Group · Sweet foods
Sponge fingers (boudoir biscuits)
The sponge finger, or boudoir biscuit (biscuit à la cuillère in French), is a batter made of eggs, sugar and flour, piped and baked until it has a dry, very porous texture. This porosity is its whole purpose: it absorbs liquids without immediately falling apart.
On the nutrition side: 366 kcal per 100 g, with 74.5 g of carbohydrate, of which 48.8 g sugars, 7.75 g of protein and only 3.4 g of fat. It is a very sweet but low-fat dry biscuit, which sets it apart from most products on its shelf.
Macronutrient breakdown
Nutrition table per 100 g
| Calories | 366 kcal |
| Kilojoules | 1550 kJ |
| Protein | 7,8 g |
| Carbohydrate | 74,5 g |
| Fat | 3,4 g |
| Fibre | 2,9 g |
Micronutrients per 100 g
All measured nutrients, ranked by share of the daily reference intake.
- Selenium7,9 µg14 %
- Phosphorus91,9 mg13 %
- Manganese0,26 mg13 %
- Vitamin B120,26 µg10 %
- Vitamin B20,14 mg10 %
- Omega-6 LA0,74 g7 %
- Vitamin B50,44 mg7 %
- Copper0,07 mg7 %
- Vitamin B9dietary folate equivalents7,85 µg
See the other 10 nutrients
- Iron0,96 mg7 %
- Vitamin B10,07 mg6 %
- Potassium117 mg6 %
- DHA0,01 g5 %
- Vitamin E0,48 mg4 %
- Vitamin A27,1 µg3 %
- Magnesium12,6 mg3 %
- Calcium25,3 mg3 %
- Total omega-30,06 g3 %
- Omega-3 ALA0,05 g3 %
Anses Ciqual 2025. Source: Anses, 2025, Ciqual food composition table
Tips
One sponge finger weighs about 7 g: count 26 kcal. That makes it a reasonable snack for a child when taken one at a time. The 366 kcal in the table only describes the whole packet.
Low in fat, very sweet: the opposite profile to a shortbread biscuit. 3.4 g of fat per 100 g, against often more than 20 g for a butter biscuit. In exchange, nearly half its weight is sugar.
It gives desserts structure without weighing them down. Charlotte, tiramisu, trifle: it replaces a buttery sponge or a shortcrust pastry with far less fat. It is the mascarpone or the cream that weigh heavily in these desserts, not the biscuit.
Dip it for a second, no more. Its porosity makes it absorb very quickly: after two seconds in coffee or syrup, it collapses. A quick in and out is enough.
It contains eggs, wheat and often milk. Three common allergens in one product, to keep in mind when preparing a dessert for a group.