Grilled Tuna Cheddar and Onion Sandwiches
In a 10 to 12 inch nonstick frying pan, combine onion, garlic, and half the broth.
Bring to a boil over high heat; stir often until liquid evaporates and browned bit stick in pan.
Add half the remaining broth; stir to scrape browned bits free, then boil again until liquid evaporates and browned bits form.
Repeat step with remaining broth, cooking until liquid evaporates.
Set onion mixture aside.
In a bowl, mix together tuna, celery, and mayonnaise. Top 4 slices bread equally with tuna mixture, onion mixture, cheese, and remaining bread.
Wipe the pan clean. Place over medium heat and add 2 sandwiches.
Cook until sandwiches are toasted on the bottom, about 4 minutes.
Turn over and toast tops, about 4 minutes more.