These cakes are bursting with fresh raspberries and nutty pistachio flavor. They're best served warm with a dollop of whipped cream.
Preheat oven to 400 degrees. Coat six 6-ounce ramekins or custard cups with cooking spray. In a food processor, finely grind nuts with sugar and salt. Add butter, vanilla, and eggs; process until smooth. Add flour; pulse just until moistened (do not overmix).
Divide batter among ramekins; sprinkle with raspberries. Place on a rimmed baking sheet; bake until firm and pulling away from sides, 20 to 25 minutes. Serve warm (or at room temperature).