Upside-Down Lemon Squares?

Upside-Down Lemon Squares? - A Cup of Green Tea with Lemon and Herbs

I made a batch of lemon squares last night with my tried and true recipe that I have made multiple times. When it was done, I let it sit on the counter until completely cool and put it in the fridge.

After about 4 hours, I took it out to cut it into squares and was shocked to find it had reversed itself! The recipe has a shortbread crust on the BOTTOM and a lemon curd on TOP but when I was getting ready to cut it up, the shortbread crust was on top!

When I put it in the fridge to cool off, it was the right way, so it did this magic trick in the fridge!

There were a few changes I made to the recipe this time:

  • I poured the lemon curd over the cooled crust instead of a hot crust.
  • I added lemon zest to the crust for extra flavour.
  • I increased the filling by 50%.

Would any of these seemingly minor changes cause this magic trick? But more important, how is it physically possible? I could see if it was different layers of a fluid cake batter that could reverse itself, but the shortbread crust is baked first so it's a solid. Not to mention it reversed in the fridge, not while baking!

It was baked in a 9 inch square pan lined with parchment paper. Does anybody want to tackle this one, so I can sleep tonight?



Best Answer

I assume the crust floated and the curd displaced around it, rather than anything actually "flipping." Actual flipping would fall under the "other members of the household" comment.

Floating merely requires the shortbread crust to detach from the bottom of the pan (perhaps aided by being cool) and lemon curd to flow under it, slowly - it may have been doing this (but not broken the surface) before it was refrigerated, and continued in the refrigerator. Nothing needs to be overly fluid for this to happen - flow in thick/viscous liquids just needs plenty of time.




Pictures about "Upside-Down Lemon Squares?"

Upside-Down Lemon Squares? - A Cup of Ta with Lemon Lying Next to a Camera and a Phone
Upside-Down Lemon Squares? - From above of glass bottle pouring water into glass with sprig of rosemary and slice of lemon placed on marble surface
Upside-Down Lemon Squares? - Woman Taking Photo with her Phone of Green Tea with LemonĀ 



Why are my lemon bars upside down?

Upside down bars - On rare occasions, bars can come out looking upside down as though the crust is on the top and most of the filling is at the bottom. Usually, this happens either when there is a big space between the crust and the sides of the pan and/or the crust is cooled down too much before you add the filling.

Why are my lemon squares runny?

If your lemon bars are too runny or jiggly, it is probably because the crust was under baked. Making the filling for lemon bars is easy \u2013 just whisk together eggs, sugar, flour, lemon juice and lemon zest.

Can you leave lemon squares out overnight?

Serving: Lemon bars are fine to keep out at room temperature for up to 6 hours or so. Storing: Store cooked lemon bars or leftovers in the refrigerator. Cover tightly with plastic wrap and store for up to 2 days.

Do lemon squares have to be refrigerated?

Do I have to refrigerate lemon bars? You definitely should keep them in a container in the refrigerator as they are a custard filling. They are fine at room temperature when you are serving them for a few hours however so don't worry about that!



Upside Down Lemon Bars Recipe with Flourless Crust




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Lisa, Lisa, Charlotte May, Lisa