Ingredients:
Walnuts:
350 g shelled walnut halves (12.3 oz)
Caramel:
5 tablespoons granulated sugar
Cake:
8 eggs (only the egg whites; the yolks are for the buttercream)
3 tablespoons granulated sugar
1 pinch of salt
1 tablespoon rum (optional)
2 tablespoons lemon juice
Walnut Buttercream:
9 tablespoons granulated sugar
200 ml milk (6.7 fl.oz/ ¾ cup + 2 tablespoons)
300 g good quality unsalted butter (at least 82% fat content, 10.5 oz/ 1 ¼ cups + 1 tablespoon)
1-2 teaspoons vanilla extract (to taste)
Directions:
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