Beat the egg whites and salt until stiff. Slowly pour in 100 g sugar, beating until the sugar is dissolved and a shiny mass is formed. Pour the beaten egg whites into a piping bag with a medium-sized star-shaped spout and squirt 4 oval Easter eggs onto a baking tray lined with baking paper. Bake in a preheated oven (electric cooker: 100 °C/ circulating air: 75 °C/ gas: see manufacturer) for approx. 1 1/2 hours. Open oven door and let Easter eggs cool down.
Stir half the pudding powder, 1 tablespoon sugar and 3 tablespoons milk until smooth. Heat cream and milk in a small pot. Stir the mixed powder into the boiling cream-milk mixture, bring to the boil and simmer for 1 minute. Remove from the heat and allow to cool.
Clean, wash and cut the rhubarb into small pieces. Bring nectar, 75 g sugar, half the orange peel and rhubarb to the boil in a pot. Cover and simmer for about 5 minutes. Stir 2 tbsp. juice and the remaining sauce powder until smooth. Stir into the boiling rhubarb, bring to the boil again and simmer for about 1 minute, let it cool down.
Stir egg liqueur and pudding until smooth. Spread over the meringue Easter eggs and arrange on plates. Spread the stewed Harber on top and serve with