Heat FitVine Cabernet Sauvignon in a frying pan over medium heat. Add flour and 2 tbsp butter, stirring till thickened. Spread wine mixture on bread, rinse pan.
Put cheese on 1 slice (mixture side up). Place 2nd slice of bread (mixture side down) on top. Spread mayonnaise on sandwich top and bottom, grill both sides till toasty and ooey-gooey cheesy.
If desired, repeat with next 2 slices to share.
Serve with a glass of FitVine Cabernet Sauvignon.