If there were a showdown of casual French cuisine, and restaurants around town were assessed according to their French onion soup ($7), Frenchie's Diner in Coral Gables would win for its perfect broth and bubbling, blistered layers of cheese. If the contest were to measure spots by their croque-monsieur ($10), Frenchie's would take the prize yet again — this time for its peerless ham sandwich smothered in béchamel and finished with golden, melted Gruyère. Similar outcomes would result from Frenchie's crème brûlée, steak frites, and duck confit ($26) — and perhaps also with its chocolate mousse, moules frites, and escargots. It might be easier to crown Frenchie's the most superb source for French cooking in town. But to rob these pretend judges of their glorious research, well, that just seems awfully cruel.