On low heat, melt 1/4 cup of the butter.
Add red onion, simmer until translucent (about 2 minutes).
Add leeks, simmer about 3 minutes.
Add remaining butter until melted.
Add chili flakes.
Turn up heat to med-high; depending on gas/electric wait until almost boiling point: THEN.
Add 1/4 cup wine; reduce 2 minutes.
Add remaining wine; reduce 2 minutes.
Add 1/2 cup chicken broth; reduce 3 minutes.
Add Black pepper and Garlic.
Add remaining chicken broth, bring to slow boil.
Once slow boil is acheived, put in your parsely, stir.
Put mussels into the pot; wait until the mollusks are opened.
Stir juices around mussels and serve with homemade garlic toast (french bread, fresh pressed garlic, fresh ground pepper and a dash of garlic salt; then the bread is broiled).
Drink a load of Sauvignon Blanc with this; and you will do the recipe justice!