Toasted Almond Macarons With White Chocolate

• 4 ounces (about 3/4 cup) whole almonds, well toasted
• 1 cup confectioner's sugar
• 1 vanilla bean, split and scraped
• 2 large egg whites, room temperature
• Pinch of cream of tartar
• 1/4 cup superfine sugar
• 4 ounces white chocolate

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