I made this as a raw salad - cooked nothing. I reduced the shallots to 2 large sliced and followed the recipe verbatim. Cooking veggies kills their flavor and nutrition. This as a raw salad was delicious.
Not a massive success I am afraid. There was far too much lemon juice, to the point of mushrooms being inedible. I would halve if not quarter the amount of lemon juice used to roast the mushrooms. The sauce being very tart (mustard + vinegar, albeit balsamic) mixed well with the broccoli, but not with the mushrooms. Doubt I will ever try this again.