Keto Asparagus with Hollandaise Sauce
Asparagus with hollandaise is one of the most beautiful warm side dishes there is, and it's almost naturally keto. Green asparagus contains only 2 g of net carbohydrates per 100 g, and a real hollandaise made from egg yolk and butter is essentially pure fat. Per serving: 4 g net carbs, 38 g fat, 8 g protein. Pairs well with salmon, steak, pork medallions, or simply with a poached egg as a light main course.
Key points at a glance
- Prep time: approx. 25 minutes.
- Approx. 4 g net carbs and 38 g fat per serving.
- Ingredients: green asparagus, egg yolk, butter, lemon, white wine.
- Important: prepare the sauce over a water bath, never heat the egg yolk directly on the bottom of the pan.
Ingredients
Serves 4 as a side dish, for example alongside salmon or beef fillet.
| Amount | Ingredient | Note | ||
|---|---|---|---|---|
| green asparagus | - | |||
| salt for cooking water | approx. 1 tsp | |||
| approx. 1 tsp | ||||
| dry white wine | - | |||
| white wine vinegar | approx. 1 tbsp | |||
| approx. 1 tbsp | ||||
| shallot | finely chopped | |||
| finely chopped | ||||
| peppercorns | - | |||
| bay leaf | - | |||
| butter | - | |||
| egg yolk | size M | |||
| size M | ||||
| lemon juice | approx. 1 tbsp | |||
| approx. 1 tbsp | ||||
| salt | to taste | |||
| to taste | ||||
| cayenne pepper | to taste | |||
| to taste | ||||
Preparation
Asparagus: Wash 800 g of green asparagus, peel the lower third on a work surface if it's woody, and cut off 1 to 2 cm from the ends. Bring 1 litre of water with 1 tsp of salt to a boil in a wide pan, add the asparagus and cook for 6 to 8 minutes until tender-crisp. Lift into a pre-warmed dish with tongs. Reduction: In a small saucepan, simmer 50 ml of dry white wine, 1 tbsp of white wine vinegar, 1 finely chopped shallot, 5 peppercorns and 1 bay leaf down to 2 tbsp, then strain through a sieve into a metal bowl. Hollandaise: Slowly melt 200 g of butter and let it cool slightly. Place the metal bowl with the reduction and 3 egg yolks over a pan of gently simmering water (the bottom must not touch the water). Whisk for 3 to 4 minutes until the egg yolk is pale and creamy and leaves trails. Drizzle in the liquid butter drop by drop at first, then in a thin stream, whisking constantly. Season with lemon juice, salt and a pinch of cayenne. Pour immediately over the warm asparagus.
Why is hollandaise a keto sauce?
Hollandaise is an emulsion of egg-yolk lecithin, water (from the reduction and the yolks) and butter fat, which makes it almost pure fat with barely any carbs. Per 100 g of hollandaise there's less than 1 g of carbohydrates but around 75 g of fat. The asparagus itself provides valuable micronutrients (folate, vitamin K, potassium) while staying very low in carbs. The combination is classic and nutritionally excellent for a ketogenic meal.
Source: USDA FoodData Central - Asparagus, raw , USDA FoodData Central - Butter, salted
Variations and rescue tips
White asparagus: Use white asparagus instead of green, peel it and cook for 15 to 20 minutes in salted water with a little lemon and butter. With a blender: Put the reduction and egg yolks into a narrow jug, blitz with an immersion blender and add the hot liquid butter in a thin stream. Ready in 2 minutes and nearly foolproof. If the sauce splits: Place a fresh egg yolk into a warm bowl and whisk in the broken hollandaise a spoonful at a time. This will rescue the emulsion. Flavour variations: Adding tarragon to the reduction makes a sauce béarnaise; a little mustard makes a mustardy version for steak; chives stirred in at the end pair beautifully with salmon.
Tips for foolproof hollandaise
- Melt the butter, but don't let it get too hot, or the egg yolk will curdle instantly.
- Keep the water bath at a gentle simmer, not a rolling boil.
- The bowl must not touch the water.
- Add the butter drop by drop first, then in a thin stream.
- Serve the sauce straight away. Finished hollandaise tends to break when reheated.
Nutrition values
| Nutrient | Per serving | Keto context |
|---|---|---|
| Calories | approx. 420 kcal | Rich. |
| Rich. | ||
| Fat | approx. 38 g | From butter and egg yolk. |
| From butter and egg yolk. | ||
| Net carbs | approx. 4 g | Low. |
| Low. | ||
| Protein | approx. 8 g | From egg yolk and asparagus. |
| From egg yolk and asparagus. | ||
| Fibre | approx. 3 g | From asparagus. |
| From asparagus. | ||
| Salt | approx. 1.2 g | To taste. |
| To taste. | ||
Note: Nutrition values are estimated averages per 100 g and per serving and may vary depending on ingredients, brands, portion size, and preparation. They do not replace individual nutrition or medical advice.
FAQ
Can I prepare the hollandaise in advance?
Classic hollandaise is a last-minute sauce. It will keep briefly in a thermos flask or over a lukewarm water bath (maximum 50 °C). Any hotter and the egg yolk will curdle. Reheating barely works, so make it fresh.
Should I use white or green asparagus?
Both work. Green asparagus gets to the plate faster, while white asparagus needs peeling and longer cooking but has the classic character. Both are keto-friendly in flavour; green contains slightly fewer carbs.
Can I make it without white wine?
Yes. Instead of 50 ml of wine use 50 ml of water plus 2 tbsp of white wine vinegar. The flavour becomes a touch sharper but still works. The wine itself can be used sparingly on keto, since the residual sugars cook off almost entirely during reduction.