Place the butter in a saucepan over high heat while whisking often. Heat while whisking often until the butter froths up and brown flecks appear.
2
Lower heat to low. Add the cheddar, broth and vinegar. Whisk until cheese is melted. Use a stick blender (or place into a blender) and puree until smooth. Taste and adjust seasoning to your liking.
3
Use over a salad, hamburger or your favorite meat.
4
Store extras in airtight container in the fridge for up to 5 days. To reheat, place in a saucepan over low heat for 2 minutes while whisking occasionally. Heat gently or it will separate.