To prepare a strawberry and mascarpone swiss roll recipe, first you need to prepare the ingredients. First, you'll need the following ingredients: 2 tablespoons softened butter, 1 teaspoon vanilla extract, and 2 teaspoons granulated sugar. Mix the butter and sugar together until it's light and fluffy. Then, add the egg yolks and beat them until they're completely incorporated. Add the vanilla and mix until the mixture is thick and creamy. Fold in the strawberries.