In a skillet, fry the bacon over moderate heat until crisp, 6 minutes.
Pour off the fat.
Add 1 tablespoon of vinegar to the bacon and cook until evaporated.
In a small bowl, whisk the grapeseed oil with the remaining 2 tablespoons of red wine vinegar, the walnut oil and mustard and season with salt and pepper.
On a baking sheet, spread the bread with the butter.
Bake for 6 minutes, or until golden.
Top each toast with a cheese half.
Bake for about 8 minutes, or until the cheese is warmed and soft.
Meanwhile, in a large bowl, toss the frisee, bacon, chives and vinaigrette.
Mound the salad on plates and set a goat cheese toast alongside.