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1
Position rack in center of oven; preheat to 375u00b0F. Toast pistachios on a rimmed baking sheet, tossing once, until fragrant and slightly darkened, 5-6 minutes. Let cool slightly, then coarsely chop.
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2
Meanwhile, butter ramekins, making upward strokes up the sides with a pastry brush. Sprinkle with sugar, tilting to coat completely and tapping out any excess. Arrange prepared ramekins on baking sheet.
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3
Combine chocolate and jam in a medium heatproof bowl set over a saucepan of barely simmering water (do not let bowl touch water); stir constantly until chocolate is melted and mixture is smooth, 1-2 minutes. Remove bowl from heat. Stir in egg yolk and 1/4 tsp. salt.
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4
Beat egg whites and a pinch of salt in the bowl of a stand mixer fitted with the whisk attachment on medium speed until frothy, about 2 minutes. Gradually add 1/2 cup sugar, 1 Tbsp. at a time, and beat until medium peaks form, 6-7 minutes.
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5
Using a rubber spatula, fold one-quarter of the beaten egg whites into chocolate mixture to lighten. Fold in remaining egg whites in 2 batches. Divide batter among prepared ramekins, filling completely.
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6
Transfer baking sheet with ramekins to oven and bake souffles until puffed and tops feel firm to the touch, 18-20 minutes.
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7
Meanwhile, using an electric mixer on medium-low speed, beat cream in a large bowl until soft peaks form. Dollop souffles with cream, top with chopped pistachios, and serve immediately.
