Line a 11x17 sheet pan with parchment. I use my finger to crease the edges then tear them off so it fits perfectly.
Melt the 10 grams of butter and brush a light layer over the parchment.
Sift together flour and cornstarch.
Combine the whole eggs, granulated sugar, vanilla and honey in the bowl of a stand mixer fitted with the flat beater bar/paddle attachment.
Mix on low speed for 30 seconds.
Turn to high (8 on my KitchenAid) and beat for 5 minutes.
The mixture should be light, fluffy and pale. Turn speed down to medium (4 on mine) and beat another 3 minutes.
Use a rubber spatula to gently transfer the mixture to a mixing bowl.
Add half of the flour mixture to the sponge.
Use the rubber scraper to gently FOLD the flour into the sponge.
Add the remaining half of the flour and fold again.
I turn the bowl as I fold and it took me about 60-90 seconds each time to incorporate all of the flour mixture into the sponge.
Gently pour the batter into the prepared pan.
Use an offset spatula to gently spread the batter into the corners and to the edges of the pan.
You should see visible air bubbles and the sponge should be approximately 1/2" thick.
Bake for 7-8 minutes until evenly golden brown
While that is baking, lightly dust a clean tea towel with powdered sugar. This will help keep the cake from sticking to the towel.
This was mine after 7 minutes.
I use a spatula to loosen the edges quickly before releasing onto the towel.
Position on one edge and quickly flip over or allow the whole pan to fall into the towel.
Remove pan and you should have sponge parchment side up!
Carefully remove the parchment by peeling it back.
Fold the edge of the towel over and roll the towel up into your sponge. This should be tightly but not too much! I would use two 👐 but I needed to hold the camera!
Place sponge seam side down on s cooling rack for a couple hours until completely cooled, or overnight.
Gently unroll and remove towel, cake will be slightly wavy.
Spread filling of your choice in an even layer over the entire sponge.
Done! Transfer seam side down to serving tray.
Use a serrated knife to cut off the ends. I eat one to test the product😉 The other I use to garnish the top!