Completely flavorless and bland. The first mistake is calling for frozen spinach. Frozen spinach is never good. It sucks all the flavor from the dish. I would suggest buying fresh spinach and wilting it down first and then letting it cool. Also, the seasoning amounts are far too conservative. The lemon juice, mustard, salt, and pepper need to be doubled or tripled. I couldn't taste ANY of the seasonings whatsoever. I will NOT be making this dish again.