How to Make It
In a skillet, toast the pumpkin seeds over moderate heat, stirring, until golden, 5 minutes. Transfer to a plate; season with salt.
Fill a large bowl with ice water. In a large saucepan of salted boiling water, cook half of the brussels sprouts until crisp-tender, about 4 minutes. Using a slotted spoon, transfer the brussels sprouts to the ice water bath to cool. Repeat with the remaining brussels sprouts. Drain well and pat dry.
In a large bowl, whisk the olive oil with the lemon juice, vinegar, shallots and mustard. Add the brussels sprouts, season with salt and pepper and toss to coat. Stir in the pumpkin seeds and dates and serve.