Ideally, prepare the rice pudding with the milk the day before according to the instructions on the packet and let it cool down. Stir occasionally and, if necessary, add a little milk to get a creamy consistency. Sweeten to taste.
Wash the strawberries with the stalk, pat dry with kitchen paper, cut away the stalk and quarter.
Line a large square dessert bowl or casserole dish with ladyfingers and soak them with the liqueur or juice.
Process 250 g of the strawberries with the preserving sugar to make strawberry sauce according to the instructions on the packet. I don`t like it that sweet, so I don`t use the whole pack of preserving sugar. Possibly set aside 2 cl sauce for decoration. Spread the sauce on the ladyfingers. Add the remaining quartered strawberries to the sauce.
Whip the cream very stiff with a little sugar and fold into the cold rice pudding. Spread the rice pudding on the strawberries.
Let it steep in the refrigerator for at least 2 hours. If necessary, decorate with the remaining strawberry sauce.