When ready to serve, prepare strawberry sauce. Combine strawberries, 1 cup sugar, lemon juice, 1 teaspoon lemon zest, salt and 1/2 teaspoon vanilla in medium saucepan and bring to boil, stirring occasionally. Remove from heat and allow to cool 3 minutes before adding cold butter. Stir sauce until butter melts. Serve sauce warm, drizzled over cheesecake.