For the Jam: Mash the blueberries with a fork.
Add the ginger and balsamic vinegar.
Add the chia seeds.
Refrigerate about 15 minutes or until thickened.
Season the steak liberally with salt and pepper.
Preheat grill to high.
Grill about 7 minutes on one side.
Flip and grill another 4 minutes or so, until medium rare.
Let rest about 15 minutes.
Slice thinly against the grain.
Slice the baguette open.
Spread a thin layer of olive oil or butter on your French Baguette.
Toast on the grill of under a broiler.
Spread a generous layer of blueberry jam on the top layer.
Spread salad dressing or Miracle whip on the bottom layer. (if using)
Layer the steak, onion and cheese.