Step 1: Heat the butter in a large pan over low heat. Add sliced onions and cook until soft, translucent and lightly browned, stirring often.
Step 2: Add the sugar and continue stirring until the onions are deep brown in colour. This may take around 20 minutes.
Step 3: Add flour and cook for 3 minutes. Add water and Bonox and simmer for 30 minutes.
Step 4: Top each slice of the baguette with a tablespoon of parmesan cheese. Toast baguette under a hot grill until golden brown.
Step 5: Serve baguette on top of the soup, and sprinkle with chopped parsley.
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