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Roasted Purple Potato Wedges with Frankfurt Green Sauce

© 2023 |

© 2023 |

Frankfurt green sauce / Frankfurter Grüne Soße from Germany is a creamy blend of fresh herbs, yogurt, sour cream, and oil that is usually served cold with hard-boiled eggs, boiled potatoes (great with roasted potatoes too) or meat. Traditionally it is made of seven different kinds of herbs: borage / Borretsch, chervil / Kerbel, cress / Kresse, parsley / Petersilie, salad burnet / Pimpinelle, sorrel / Sauerampfer and chives / Schnittlauch. I simply used a mixture of fresh herbs and greens, so put together your own mixture if you cannot find all the taditional herbs.
This healthy combination of seven tasty and finely balanced herbs was one of Johann Wolfgang von Goethe's favourites. A famous myth is that this sauce was invented by his mother. Actually, the first green sauce recipe was published in 1860 in a cookbook by Wilhelmine Rührig.
This distinctive green sauce is a perfect bold partner for those roasted purple potato wedges. This recipe will probably make more green sauce than you need but it is delicious on many things, such as toasted sourdough bread, roasted carrots, pumpkins or bbq chicken.

Green Sauce
  • 800 g Purple potatoes
  • 2 tbsp Olive oil
  • Salt and black pepper
  • 200 g Fresh herbs, chopped (I used a mixture of dill, parsley, mâche, chives, sorrel, chervil and arugula)
  • 100 g Sour cream
  • 120 g Greek yoghurt
  • 2 tbsp Extra-virgin olive oil
  • 1 tbsp Lemon juice
  • Salt and pepper
  • Coarse salt to garnish, optional
  • Dried cornflower to garnish, optional
  • Green chilli pepper, cut into rings to garnish, optional
  1. Preheat oven to 200C/400F. Line a large baking tray with parchment paper.
  2. Wash, dry and cut the purple potatoes into quarters lengthways. Place potato wedges in a large bowl and cover with cold water. Set aside for 30 minutes. This allows for some starch to be released. Drain well and pat potatoes dry in a clean dry tea towel. Transfer to a bowl, add in olive oil and toss to coat the potato wedges in the oil.
  3. Spread the potato wedges evenly onto the prepared tray. Roast in oven for 15 minutes, then turn pieces over. Roast for a further 10-15 minutes, until the skin is crispy and crunchy and flesh is fork tender.
  4. Meanwhile prepare the sauce. Finely chop fresh herbs and puree together with sour cream, yoghurt, olive oil, lemon juice, salt, and pepper with an immersion blender.
  5. Spoon some green sauce on the serving plates, top with potato wedges and sprinkle some coarse salt over. Garnish with dried cornflower and green chilli rings if using.

© 2023 |

© 2023 |

© 2023 |


Velva 24/2/23 21:16

Angie, before I even got to the end of your post... I thought wow, you could use this green sauce for so many things. Definitely love the sauce and the purple potatoes-not always easy to find. btw, love the photograph. The purple really stands out.

Cooking Julia 24/2/23 23:10

These purple potatoes are incredible!

Brian's Home Blog 24/2/23 23:18

I'll bet that's good, we like those purple taters!

Tom 25/2/23 01:07

...I've never had purple potatoes.

My name is Erika. 25/2/23 01:51

I bet this sauce tastes good with potatoes. I haven't heard of this green sauce, but it sounds yummy.hugs-Erika

Eva Taylor 25/2/23 02:53

What beautiful colours on a plate. The green sauce must taste fantastic with that combination of herbs.

David 25/2/23 03:43

Angie, I do like roasted purple potatoes...and other varieties as well. However, I'd like them with a nice pork chop or a rack of lamb. You had 5 eggs and a big ribeye for breakfast!? Wow! My kind of early morning wake me up... Take Care, Big Daddy Dave

Rose world 25/2/23 05:49

Such purplish potatoes. Never seen it. Even the skin is deep purple.

I like sweet potatoes, especially those yellow Japanese type.

Anonymous 25/2/23 06:36

Yum yum. Loks stricking. The green sauce is a great idea and I love hearing about these kind of local foods.

Eha Carr 25/2/23 06:42

Oh, have always loved the 'Frankfurter Sosse' but make it a tad less fatty . . . I grew up on pink and blue potatoes in Europe - can get the purple ones here in Australia but only at specialist greengrocers . . . yes, great with the sauce but I often use the latter with fish balls > lovely !!!

Wyld Club 25/2/23 07:18

very delicious thanks for posting going to try this I have heard alot about how healthy this super food greens are
Vip Table Booking

ashok 25/2/23 07:59
This comment has been removed by the author.
ashok 25/2/23 07:59

Never seen purple potatoes ..looks good

Happy Retiree's Kitchen 25/2/23 08:57

You've captured my favourite colours in your wonderful dish of German food. Such beautiful photos, you've excelled yourself. I'm not sure I can find purple potatoes but I'd love to make this sauce. Looks so delicious, thanks Angie.

Rainbow Evening 25/2/23 10:01

never tasted purple potato... look appealing....
Thank you for sharing.

eileeninmd 25/2/23 12:42

Another yummy dish, I have tried the purple potatoes they are good.
Thanks for sharing. Have a great weekend.

DEZMOND 25/2/23 13:35

Purple and green is one of my fave colour combos ever! Sadly, we don't have either purple potatoes here nor purple carrots, even the batat potato, the sweet potato is quite expensive compared to the regular one.

Anonymous 25/2/23 14:00

Angie, this dish is a delight for the eye as well as the palate. It almost looks like it should be served for Mardi Gras., Bernadette, New Classic Recipe

[Reply] 25/2/23 15:18

I've never had or seen purple potatoes, so pretty and the green sauce sounds amazing!

Lola Martínez 25/2/23 15:37

Estoy segura que esa salsa con historia, le va divina a estas preciosas patatas.
Un beso.

Bill 25/2/23 17:32

We had purple potatoes once and liked them.

Liz That Skinny Chick Can Bake 25/2/23 18:10

The contrasting colors in this potato dish are phenomenal!!! A beautiful AND delicious way to prepare potatoes. Have a great weekend, my friend!

Julie Ann Lozada 25/2/23 19:40

wow. i really like this recipe and your purple potato. we have purple potato in our country too but not as purple as yours.

INSTAGRAM: @julieann_lozada

Hena Tayeb 25/2/23 20:37

Wow the is the most beautifully colored meal.

Norma2 25/2/23 23:52

The story you tell us about the sauce with which you accompany the potatoes is interesting. A very colorful dish that makes you want to try it.
kisses Angie

Margaret D 26/2/23 04:57

Interesting and I can say we don't often see purple potatoes on the Island.

Federica Simoni 26/2/23 16:02

bellissimo piatto, complimenti!

Raymund 26/2/23 22:12

Thank you for sharing this recipe for roasted purple potato wedges with Frankfurt green sauce! I've never heard of this sauce before, but it sounds like a delicious and healthy combination of fresh herbs, yogurt, sour cream, and oil. I appreciate that you provided some background on the history and traditional ingredients of the sauce, as well as suggestions for alternative herbs and ways to use any leftover sauce. I'm looking forward to trying this recipe out for myself and experimenting with different herbs and pairings. Thanks again for sharing!


Que de couleurs dans cette assiette ! j'adore.

foodtravelandwine 27/2/23 03:57

I love it!.....great combination of colors and flavors!.....Abrazotes, Marcela

Carol @Comfort Spring Station 27/2/23 13:46

The green sauce sounds wonderful. I like purple potatoes too.

Anonymous 1/3/23 14:08

Judee from Gluten Free A-Z : I LOVE potatoes and the purple ones are so intriguing but very expensive here. I'll be they are delicious in that incredible herbed sauce.

tigerfish 3/3/23 00:47

Love purple potatoes and purple sweet potatoes. Flip side is - they are usually more expensive than the red, and white variety


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