Active ingredients: 1 beef tenderloin, trimmed (about 3 pounds),1/ 2 tablespoon cayenne pepper,1 lot chives, carefully chopped,1 tablespoon toasted coriander seeds,1/ 2 cup creme fraiche,1 tablespoon toasted cumin seeds,1 garlic clove, smashed and carefully chopped,1/ 2 cup ready horseradish,1/ 2 lemon, juiced, Kosher salt, Kosher salt. if needed,1/ 2 cup mayonnaise,Extra-virgin olive oil,2 bunches spring onions, stems removed, cut in 1/2
Directions: