Frankfurt Green Sauce Recipe: Traditional Herb-Infused German Emulsion

This traditional German sauce brings authentic Frankfurt flavor to your table. I discovered its versatility while foraging wild herbs, realizing how seven fresh varieties could create such a bright, tangy emulsion.

The secret lies in balancing sour cream or yogurt with finely chopped herbs like chives, parsley, and chervil. This creates a traditional sauce that’s both creamy and refreshing, perfect for drizzling over boiled eggs or potatoes.

What makes this sauce special is its simplicity—no cooking required, just fresh ingredients and a little patience. The herbs release their essential oils, infusing every bite with garden-fresh flavor.

Store in the refrigerator for up to three days. The flavors deepen over time, making it even better the next day.

Ingredients for Frankfurt Green Sauce

Twelve fresh components create this bright, herb-packed German emulsion with zero cooking required.

The herbs are everything here. Farmers markets are your best bet for chervil and burnet (the wild, foraged stuff is even better). If you can’t find burnet, borage or watercress can stand in—just keep the quantity light. Whole Foods usually carries chervil in the spring. Look for herbs with vibrant color and crisp stems—wilted greens won’t give you that essential oil punch.

No chervil? Mint at half the amount works in a pinch (it’s bold, so go easy). Out of dill? Fennel fronds add a similar anise note. For the sour cream base, full-fat Greek yogurt is a perfect swap—thicker, but still tangy. The vinegar can be any white variety, but avoid balsamic (too dark, too sweet). Diamond Crystal salt is my go-to if you’re measuring by volume.

This sauce is best fresh but keeps 3 days in the fridge. The flavors meld and deepen overnight (worth the wait). Store in a glass jar with a tight lid—plastic can absorb odors. Give it a good stir before using, as the herbs settle.

Step-by-Step Instructions for Frankfurt Green Sauce

Here’s the traditional method I use to create this classic German emulsion with perfect texture every time.

Step 1: Prepare and Chop the Fresh Herbs

Finely mince the 0.5 cup Fresh Chives, 0.75 cup Fresh Parsley, 0.5 cup Fresh Chervil, 0.5 cup Fresh Dill, 0.25 cup Fresh Tarragon, and 0.25 cup Fresh Burnet. I use a sharp chef’s knife and rock it back and forth for even, fine pieces.

Real talk: the texture of your herbs makes or breaks this sauce. You want them finely minced, not roughly chopped, so they distribute evenly and create that signature vibrant green color. Remove any thick stems from the parsley and chervil—they can be bitter.

This step takes about 10-12 minutes but it’s worth the effort. The aroma alone as you chop will make your mouth water. Place all the minced herbs in a large bowl once finished.

Step 2: Create the Creamy Base

In a separate medium bowl, whisk together the 1.5 cups Sour Cream and 0.5 cup Plain Yogurt until completely smooth. I prefer full-fat sour cream for its rich texture, but the yogurt adds a nice tang that balances the richness.

Add the 1 tbsp Dijon Mustard, 2 tbsp White Wine Vinegar, 0.5 tsp Salt, and 0.25 tsp White Pepper. Whisk vigorously for about 30 seconds until fully incorporated. The vinegar should be evenly distributed with no visible streaks.

Here’s the thing—this base needs to be perfectly smooth before you add the herbs. Any lumps in your sour cream or yogurt will show up in the final sauce, and we want that silky texture Frankfurt green sauce is known for.

Step 3: Combine Herbs and Cream Base

Pour the creamy base over the minced herbs in the large bowl. Using a silicone spatula, gently fold everything together until the herbs are completely coated and the mixture is uniform in color.

Don’t rush this step. I fold for about 2-3 minutes to ensure every bit of herb is incorporated. The color should be a vibrant, consistent green with no white streaks from the cream base. If it looks too thick, resist the urge to thin it—the flavors will meld during the resting time.

The sauce will look quite thick at this point, but that’s normal. The herbs will release some of their natural juices as it sits, creating the perfect consistency.

Step 4: Rest and Chill for Flavor Development

Cover the bowl with plastic wrap, pressing it directly onto the surface of the sauce to prevent a skin from forming. Refrigerate for at least 2 hours, but overnight is ideal if you have the time.

This resting period is crucial. It allows the flavors to marry and mellow, and the herbs to infuse their essence into the creamy base. I’ve found that the vinegar sharpness softens beautifully during this time, creating that perfectly balanced flavor profile.

When ready to serve, give it a good stir. The texture should be creamy but not runny, with the herbs evenly suspended throughout. Taste and adjust seasoning if needed—I sometimes add a pinch more salt if the herbs were particularly mild.

Storing and Reheating This frankfurt green sauce

Refrigerator Storage

After making this vibrant emulsion, transfer it to a clean glass jar with a tight-fitting lid—I use Ball Mason jars. The sauce will keep in your fridge at 40°F or below for up to 3 days. The flavors actually improve overnight as the herbs continue to infuse. 🌿

Freezer Considerations

Honestly, I don’t recommend freezing this sauce. The fresh herbs lose their bright flavor and the texture separates when thawed. If you must freeze, portion into ice cube trays and use within 1 month, but expect some texture changes.

Chill Before Serving

Always serve this sauce well-chilled. Remove it from the fridge 15-20 minutes before serving to take the edge off the cold. Give it a vigorous stir before using, as the herbs naturally settle at the bottom of the container.

Reviving Leftovers

If your sauce thickens in the fridge, stir in 1-2 teaspoons of cold water to restore the creamy consistency. Avoid adding milk or cream, as this can dilute the herb flavors. The color may darken slightly over time, but the taste remains fresh.

Storage Tip

Press plastic wrap directly onto the surface before sealing the lid to prevent a skin from forming. This also helps maintain that vibrant green color. I learned this trick during my French training—it works for any cream-based sauce. ❄️

Make-Ahead Convenience

This sauce is perfect for making a day ahead. The resting time actually enhances the flavors, making it even better for your meal. Just

Frequently Asked Questions