These mussels and clams are steamed in a fragrant broth of shallots, herbs, and white wine. You'll want lots of grilled toasts to sop up the juices.
Scrub mussels and clams in cool water. Remove beards from mussels, and discard all broken or opened shells. Remove from water, and refrigerate until needed.
Heat broiler or grill to medium-high heat. Brush bread slices with olive oil on both sides. Place on grill or under broiler for about 30 seconds on each side or until golden. While still hot, rub tops with cut side of garlic clove.
Place a large stockpot on grill or stove over medium heat. Add butter. When melted and bubbling, add leeks, shallots, thyme, oregano, bay leaf, and chile. Saute until leeks and shallots are translucent, about 10 minutes. Add white wine, and salt and pepper to taste; bring to a simmer. Add mussels and clams; cover; cook until shells open, about 7 minutes. Serve in a bowl with the croutons.
If you want to rewarm croutons, place on a grill or in an oven just before serving.