Step 1

Place the butter in a large saucepan and melt it over medium heat.

Step 2

Add the carrots and onion and cook, stirring occasionally, until the onion is soft and transparent, about 5 minutes.

Step 3

Stir in the flour and cook, stirring constantly for 1 to 2 minutes.

Step 4

Add the broth and milk. Heat, stirring constantly, until thick and bubbly.

Step 5

Add the tuna, celery seed, Worcestershire sauce and continue to cook, stirring occasionally, until heated through.

Step 6

Add the cheese and stir until it melts.

Step 7

Season to taste with salt and pepper.