It's dinner time!

Ingredients

• ¼ cup butter
• 1 onion, chopped
• ½ (12 fluid ounce) can evaporated milk, or as needed
• 2 pounds processed cheese food (such as Velveeta®), cubed
• ¾ pound cooked and peeled whole crawfish tails
• 24 brown and serve pistolette rolls
• 2 quarts vegetable oil for frying