Rinse and pat dry trout. Season inside and out with salt and pepper to taste. Coat trout with flour.
Heat 2 tablespoons butter in large frypan over high heat until melted. Add trout and brown both sides. Lower heat to medium and cook for about 5 minutes on each side or until cooked through. Remove trout to a serving plate and keep warm.
Wipe out pan and add 2 tablespoons butter. Cook butter over medium heat until it just begins to brown. Add the almonds and brown.
Pour sauce and almonds over fish and sprinkle with lemon juice and parsley. Garnish with fresh lemon slices.