Place the ladyfingers side by side in a mold. Mix 3 tablespoons of orange liqueur with the orange juice and drizzle over the biscuits.
Wash the raspberries, sort them and spread them on the sponge fingers. Mix the ricotta with the mascarpone and the remaining orange liqueur until smooth, season with sugar. Spread over the raspberries and smooth out.
Melt the couverture in a hot water bath, spread it thinly on a kitchen board and let it solidify. Scrape off large curls with a knife. Place the chocolate curls on the ricotta and mascarpone cream, dust lightly with cocoa powder.
Let the dessert steep in the refrigerator for about 4 hours.