Plum and Almond Slice with Cognac Zabaglione

In each book I like to include a frangipane or bakewell tart, so this one is not missing out. Instead of being a round flan I’m using a rectangular ‘ring’ 20 × 10 × 4 cm (8×4× 1½ in), but if you can’t find one use a 20 cm (8 in) flan ring. When a slice is cut you see the plums running through. It looks and eats really well, with the moist frangipane holding it all together. As for the cognac zabaglione, this is an optional extra that is so delicious with the flan. It just gives the whole di