Place the almonds and breadcrumbs in a food processor and pulse until coarsely ground into a crumb-like mixture. Place the crumb mixture on a plate or in a shallow bowl. Heat oil and butter in a frying pan over medium-high heat. Spread each tilapia filet with 1 tablespoon Dijon mustard on both sides. Press the tilapia into the crumbs to get it coated on both sides. I usually do this several times to make sure the whole thing gets covered. Place the fish into the frying pan and cook for several minutes on each side, until the outside is browned and the fish is fully cooked. I usually just check the middle of the fish for doneness - pieces will flake off easily when it's done. Serve with parmesan, sea salt, or lemon.