Preheat oven to 350°F (180°C) with rack in middle.
Butter and flour an 8-inch round cake pan.
Pulse cooled walnuts and sugar in a food processor until finely chopped.
Add butter and process until combined.
Add eggs and vanilla and process until combined.
Add flour, baking powder, and salt and pulse just until incorporated.
Spread batter in cake pan.
Bake until cake is just firm to the touch and a wooden pick inserted into center comes out clean, 30 to 35 minutes.
Cool 15 minutes in pan, then turn out onto a rack and cool completely.
For the topping:
Whisk lemon juice (if using) into jam.
Spoon jam over cake.
Beat heavy cream with sour cream, sugar, and vanilla until it holds soft peaks.
Spoon cream mixture over jam.
Servings\Yield
Makes one 8-inch round cake, serves 12
Nutrition Facts
Nutrition Per Serving (based on 12 servings) - Calories: 285; Total Fat: 18g (Saturated Fat: 8g); Cholesterol: 95mg; Sodium: 140mg; Total Carbohydrates: 28g (Dietary Fiber: 2g, Sugars: 22g); Protein: 5g; Calories from Fat: 162 (57%)
*Nutrition information is provided as a general estimate only. Nutrient information is not available for all ingredients, and is based on available nutrient data. Variations may occur based on ingredient brands and preparation methods.
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