Preparation Place flour in baking pan. Season with salt and pepper. Melt 4 tablespoons butter in heavy large Dutch oven over medium-high heat. Working in batches, coat meat with flour; add to pot and brown on all sides. Using slotted spoon, transfer to plate. Melt 2 tablespoons butter in same pot over medium-high heat. Add onions; sauté until tender, about 6 minutes. Mix in tomato paste, then wine. Bring to boil, scraping up any browned bits. Add broth and sugar, then beef and any accumulated juices. Bring to boil. Reduce heat, cover partially and simmer 1 1/2 hours. Add potatoes and carrots; simmer uncovered until meat and vegetables are almost tender, about 25 minutes. Add squash; simmer until almost tender, about 10 minutes. Add mushrooms and 3 tablespoons marjoram; simmer until mushrooms are tender, about 5 minutes. Season with salt and pepper. (Can be made 1 day ahead. Cool slightly. Cover, chill. Before serving, cook over medium heat, stirring occasionally.)
Preparation Place flour in baking pan. Season with salt and pepper. Melt 4 tablespoons butter in heavy large Dutch oven over medium-high heat. Working in batches, coat meat with flour; add to pot and brown on all sides. Using slotted spoon, transfer to plate. Melt 2 tablespoons butter in same pot over medium-high heat. Add onions; sauté until tender, about 6 minutes. Mix in tomato paste, then wine. Bring to boil, scraping up any browned bits. Add broth and sugar, then beef and any accumulated juices. Bring to boil. Reduce heat, cover partially and simmer 1 1/2 hours. Add potatoes and carrots; simmer uncovered until meat and vegetables are almost tender, about 25 minutes. Add squash; simmer until almost tender, about 10 minutes. Add mushrooms and 3 tablespoons marjoram; simmer until mushrooms are tender, about 5 minutes. Season with salt and pepper. (Can be made 1 day ahead. Cool slightly. Cover, chill. Before serving, cook over medium heat, stirring occasionally.)