Celeriac Remoulade and Salmon Gravlax Toasts

Ingredients

• • 1 small red onion, sliced into thin rounds
  • 2 tbsp (30 ml) mayonnaise
  • 2 tbsp (30 ml) sour cream
  • 1 tbsp (15 ml) whole-grain mustard
  • 1 tbsp capers, chopped
  • 1 tbsp dill, finely chopped, plus more for serving
  • 1 tsp (5 ml) lemon juice
  • 1 can (14 oz/398 ml) grated celeriac (celery root), drained and lightly patted dry
  • 4 slices multi-grain bread, each about ¾ inch (2 cm) thick, toasted
  • ½ block (125 g) cream cheese, softened
  • 7 oz (200 g) store-bought sliced salmon gravlax