Chocolate and pineapple brownies - Aliette de Bodard

Ingredients

• 100 g dark chocolate
• 1 can pineapple slices (340g, 10 slices)
• 120g sugar (be prepared to throw in some of the juice from the can if the mixture's too liquid, or to adjust the flour if it's too dry)
• 140g flour
• 1 bag vanilla sugar (8g sugar and a dash of vanilla extract otherwise)
• 2 eggs
• 125g butter