How to Make It
Preheat the oven to 450°. In a food processor, coarsely grind the almonds. Add the butter, garlic, shallot, parsley, lemon juice, lemon zest, jalapeño and pepper; process until blended. Season the almond-garlic butter with salt.
Put the mussels in a large roasting pan and add the wine. Spoon the almond-garlic butter over the mussels and roast for 12 minutes, stirring the mussels and shaking the pan a few times, until all of the mussels have opened; discard any that do not open.
With a slotted spoon, transfer the mussels to bowls. Spoon the almond-garlic butter on top.