Hazırlanışı
1Melt 75 g butter and 28 g olive oil in a large pot over medium-low heat.
2Add 2000 g sliced onions and cook slowly, stirring occasionally, for 45-60 minutes until deeply caramelized.
3Stir in 8 g flour and cook for 1 minute, then add 98 g white wine and scrape the pot.