Gratinéed Asparagus Toast

Ingredients

• • 2 onions, chopped
  • 3 tablespoons (45 ml) olive oil
  • 1/2 teaspoon (2.5 ml) mustard seeds
  • 1/2 lb (225 g) thin asparagus, cut into 1/2-inch (1-cm) lengths (keep the tips whole)
  • 1/4 cup (60 ml) chicken broth
  • 12 diagonal thin slices baguette
  • 1 1/2 cups (375 ml) grated cheese (Emmenthal or other cheese of your choosing)
  • Salt and pepper