Carrots and butternut squash roasted with Harissa and Hungarian paprika covered in caramelized onions, then baked to custardy perfection in a whole-wheat tart shell. All topped with sage browned butter.
Combine the whole-wheat flour, pastry flour, salt and black pepper in a food processor. Sprinkle the cubed butter on top. Pulse until large chickpea sized pieces remain (I like to keep the butter larger than peas with the food processor method because I find that otherwise the butter works into the dough too much by the time the water has been added).
Add several tablespoons of water at a time through the chute of the food processor, and pulse after each addition. Open the lid to check the consistency after each addition. Once the dough looks crumbly, dump it out onto the counter. Gather the dough and press it away from you with the heel of your hand until it comes together. This technique is called fraisage. If it is stubbornly crumbly, add a touch more water by wetting your hands before fraisage.
Once it comes together, pat it into a disk, wrap in plastic wrap, and refrigerate for 45 minutes to overnight.
You can watch a tutorial on this method here.
To roast the vegetables:
Pre-heat oven to 350°F with the allocated sheet pan inside the oven.
In a large bowl combine the squash, carrots, salt, Harissa, paprika, and 2 tablespoons of olive oil. Spread vegetables on the pre-heated sheet pan and roast for 40-60 minutes, stirring occasionally, until the carrots and squash can easily be punctured with a fork.
To caramelize the onions:
Melt butter and olive oil in a Dutch oven or non-reactive pan over medium heat, stirring as needed.
Add onions, stirring to coat. Spread them out in as even a layer as possible, sprinkle with sugar and cook, stirring as needed to keep the onions from sticking.
Continue to cook until the onions are soft and smell fragrant and sweet. You want them to be a beautiful dark brown. It takes almost an hour but is a mostly passive task.
Remove from heat, season with salt and pepper.
Roll out tart shell and par-bake:
While the vegetables roast and onions caramelize, roll out your tart shell to ⅛ inch thick and line a 9-inch tart shell or a pie dish. Refrigerate at least 20 minutes before trimming the edges.
Remove vegetables from the oven and increase the oven temperature to 425°F. Line the chilled tart shell with parchment paper and fill with baking weights or beans. Bake in pre-heated oven for 15 minutes and then remove the parchment and beans. Continue to bake until the shell begins to brown and the bottom no longer looks raw, approximately an additional 10 minutes. Lower the oven back down to 350°F.
Make the filling:
While your tart shell par-bakes, make your filling! In the food processor, combine the roasted vegetables and evaporated milk. Process until smooth. Taste and add additional salt and pepper as needed. You can also add more Harissa at this point if you want it a little spicier! Add the eggs and process until smooth.
Pour into warm tart shell and smooth the surface with an offset spatula (Or don’t. No one will know the difference.) Carefully drop the caramelized onions onto the surface of the tart, leaving a little gap, so that you can see the filling in places.
Bake 30 minutes at 350°F or until the center is no longer liquid. Cool completely before cutting.
To make the browned butter:
In a small saucepan melt the butter over medium-high heat. Once your butter is melted add the sage.
Continue to cook over medium-high heat, swirling occasionally, until the butter has taken on a nutty aroma and you can see little brown bits at the bottom of the pan. Pour into a bowl or the butter will continue to cook in the pan.
Drizzle the browned butter over the whole tart or serve with each slice. Store extra browned butter in the refrigerator and then warm it in the microwave prior to serving.
The tart can be re-warmed in a 350°F oven. It is best served warm.
Notes
Presentation - I like to make sure there are small peeks of the tart filling between the caramelized onions for pops of color, and I also love drizzling the sage browned butter on individual slices for added buttery nuance.Flavor Tips - You can use a store-bought crust (tear) or my easy all-butter pie crust instead but the whole-wheat adds another level of flavor to the tart. Not to mention extra fiber and protein!Technique - The tart shell can be made using any of the 5 ways inmy video tutorials! The food processor is definitely the fastest. I like to keep the butter larger than peas with the food processor method because I find that otherwise the butter works into the dough too much by the time the water has been added.Helpful Tools - I personally use a cast iron skillet, but be sure to caramelize your onions in a non-reactive pan or Dutch oven that can evenly distribute heat for a longer period of time. Variations - You can make this same recipe into a 9-inch pie (instead of tart). The crust and filling recipe will be the same!Storage - You can make the tart shell up to 3 days before assembling and baking the tart. Store in an air-tight container in the refrigerator for up to 3 days. Re-warm before serving.Yield: 1-9 inch tart