Preheat oven at 400° Fahrenheit.
Start by chopping tomatoes, then place them in fine mesh strainer or colander over bowl or sink to let extra liquid drain. Let drain for at least 10 minutes, stirring tomatoes around with spoon a few times.
Once tomatoes have released liquid, place them in large bowl and add fresh parmesan, chopped basil, minced garlic, balsamic vinegar, olive oil, salt and black pepper, and gently mix together. Cover bowl with plastic wrap or lid, and place bowl in the fridge.
Season steak with salt and pepper and cook as you wish to your preferred doneness. You can grill it until desired doneness, or cook it in a cast iron skillet with butter. *see notes. Let steak rest for 10 minutes before slicing.
Place slices of baguette onto a baking sheet in one single layer. Brush each piece on each side with olive oil. Place in oven, and cook for about 10 minutes, flipping halfway, or until crostinis are just turning golden and crispy. When ready, rub every piece with garlic clove.
Assemble bruschetta by placing a slice of filet mignon onto slice of bread crostinis, top with tomato mixture, more freshly grated parmesan and a drizzle of balsamic glaze. Enjoy right away.