Alsatian Caramelized Onion Pizza

Alsatian Caramelized Onion Pizza is my take on the Trader Joe's Tart d'Alsace. It's easy to make and a great way to use up leftovers.
Alsatian Caramelized Onion Pizza

Last Updated on June 11, 2022

Alsatian Caramelized Onion Pizza
Alsatian Caramelized Onion Pizza with mushrooms, olives, and ham

Alsatian Caramelized Onion Pizza is my take on the Trader Joe’s Tart d’Alsace. I’ll tell you how to make overnight caramelized onions, too.

The first time I had Tart d’Alsace, they were offering small samples of it. I fell in love and bought one right away. Recently, I had an abundance of onions, and I decided to make it at home. What I made was well worth it, and not that difficult. I’m very grateful to those bakers testing their ovens.

The dish was created by Germanic farmers from Alsace, Baden and the Palatinate who used to bake bread once a week. A Flammkuchen would be used to test the heat of their wood-fired ovens. At the peak of its temperature, the oven would also have the ideal conditions in which to bake a Flammkuchen. The embers would be pushed aside to make room for the cake in the middle of the oven, and the intense heat would be able to bake it in 1 or 2 minutes. The crust that forms the border of the Flammkuchen would be nearly burned by the flames. The result resembles a thin pizza.

Cite:
Wikipedia

Overnight Caramelized Onions

I think that caramelized onions scare people. After all, it means slicing a lot of onions thinly, then setting them in a pot at low heat and simmering down to almost nothing – and you have to babysit and watch it. No, thank you!

But, not anymore. I followed advice from a Facebook group member who said she put her onions in the slow cooker overnight. A game changer! No more having to babysit, stir, or anything else.

It’s an effortless procedure. Slice about six onions thinly, then dump them in the well of a slow cooker with a couple of tablespoons of butter and a little salt and pepper. Put the machine on low, cover it, and come back 12 hours later. All the onions will be beautifully brown and soft. There will be liquid. If you want to make French Onion soup, stop there. If you’re going to use them for something else, like this pizza, leave the top slightly ajar and let them keep cooking for another 3 hours.

You can do this in your sleep – literally.

You can add balsamic vinegar as described in Balsamic Caramelized Onions.

Alsatian Caramelized Onion Pizza Ready for the Oven
Alsatian Caramelized Onion Pizza Ready for the Oven
Alsatian Caramelized Onion Pizza

Alsatian Caramelized Onion Pizza

Alsatian Caramelized Onion Pizza is my take on the Trader Joe’s Tart d’Alsace. It’s easy to make and a great way to use up leftovers.
Prep Time: 15 hours 10 minutes
Cook Time: 15 minutes
Total Time: 15 hours 25 minutes
Cuisine: Alsatian, French, German
Difficulty: Easy
Newsletter: 2020-05-31
Servings (slide to adjust): 8
Calories: 194kcal

Ingredients

~~ — For the Caramelized Onions — ~~

  • 6 Onions, thinly sliced
  • 2 tablespoon butter
  • ¼ teaspoon Kosher Salt
  • ¼ teaspoon Black pepper, freshly ground

~~ — For the Tart — ~~

  • 1 pizza dough, rolled out thinly
  • ¼ cup Sour cream
  • 1 cup Swiss, shredded or sliced
  • ¼ cup Ham, thinly sliced
  • 4 tablespoon parmesan, grated
  • 2 Mushrooms, thinly sliced (optional)
  • 8 Black olives, whole or sliced (optional)
Ingredients necessary for the recipe step are in italic.

Instructions

Make the Caramelized Onions

  • 6 Onions, 1/4 teaspoon Kosher Salt, 1/4 teaspoon Black pepper, 2 tablespoon butter
    Slice the onions thinly, then dump them in the well of a slow cooker with the butter, salt, and pepper. Put the machine on low, cover it, and come back 12 hours later. All the onions will be beautifully brown and soft. There will be a liquid that needs to be evaporated. Leave the top slightly ajar and let them keep cooking for another 3 hours. You only need about 1/2 cup of these onions, just freeze the rest.

Make the Tart

  • Preheat your oven to 500 F/ 260 C. It’s going to take a while to get that hot, so be aware of that.
  • 1 pizza dough
    Roll the dough out thinly. You can use a pizza pan if you want, or you can put parchment paper on a pizza peel and put the dough on that.
  • 1/4 cup Sour cream, 4 tablespoon parmesan
    Spread the sour cream on the pizza dough and cover it loosely with some of the parmesan.
  • 1 cup Swiss, 1/4 cup Ham, 2 Mushrooms, 8 Black olives
    Put the onions all around with the swiss cheese, ham, mushrooms, and olives, if using. Cover with more grated parmesan.
  • Bake for 15 minutes, checking at 12 minutes, or until the crust has started to brown and the cheese has all melted.

Nutrition

Calories: 194kcalCarbohydrates: 9gProtein: 11gFat: 13gSaturated Fat: 8gPolyunsaturated Fat: 1gMonounsaturated Fat: 4gCholesterol: 38mgSodium: 450mgPotassium: 207mgFiber: 1gSugar: 3g
Got Questions? Let me know!Mention @arbpen or tag #arbpen!
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About arbpen

As an award-winning and serious home cook, I seriously believe there is no reason why you can't have a restaurant quality meal at home. One of the good things about eating at home is to save money, so armed with a good menu plan, a shopping list, and an appreciation of good food, we can all have gourmet food on a budget.

2 Responses to Alsatian Caramelized Onion Pizza

  1. Pingback: Rotisserie Stuffed Roast - Pork with Caramelized Onions - The Good Plate

  2. Noreen Jones says:

    5 stars
    Wow! Thank you so much for the method of making caramelized onions. I was going to get rid of my slow cooker because it was just taking up shelf space. Now it has a purpose. I love caramelized onions!