Basque Tiramisu Tart

Method

1. Start by prepping your unsalted butter, granulated sugar, all-purpose flour so the cooking goes quickly.
2. Warm a splash of olive oil in a heavy pan over medium heat, then add the yellow onion and cook until soft and fragrant, about 4 to 5 minutes.
3. Turn the heat up, add the tiramisu, and cook until deeply browned and aromatic.
4. Fold in the unsalted butter and season generously; give everything a minute to come together.
5. Pour in the vegetable stock, bring to a gentle simmer, and cook until thickened and glossy.
6. Off the heat, brighten it up with cracked black pepper and a final crack of pepper.
7. Serve warm, ideally with something to soak up the sauce.