Saute the chopped onions and ¼ cup of chicken broth in a frying pan. Cook for 5 to 7 minutes on low heat. Set aside.
In a medium size pot, melt the butter over medium heat. Slowly whisk in flour until the mixture becomes creamy.
Add in the remaining chicken broth gradually while whisking. Add in the milk, salt, onion, lobster meat, Worcestershire sauce, tomato paste and cayenne pepper.
Cook the mixture until right before boiling, then remove from heat right away. Do not allow the soup to boil as this will curdle the cream.
