Prepare pasta according to package directions. Drain well; keep warm.
Meanwhile, in a large saucepan or Dutch oven melt the margarine or butter. Stir in broccoli, sweet pepper, and Jerusalem artichokes and/or celeriac. Cook and stir over medium-high heat for 5 minutes. Stir in pea pods. Cook, covered, for 1 minute more. Gently stir in semisoft cheese, milk, and cooked pasta. Season to taste with freshly ground black pepper. Garnish each serving with nuts and shaved cheese. Makes 4 main-dish servings.