So soupe a l'oignon it is.
I'll admit, I made this up, it may be a mile or two from the authentic, but it tasted delicious, and there's none left. When the humidity reaches about 90%, my inclination to research tends towards zero.
I very gently sweated 3 medium sized onions for about 40 min, with a spoonful of soft brown sugar and some oil.
The stock was ready and heated, and when the alcohol was burnt off the onions, I added it, and seasoned to taste. Yum.
Meanwhile, I sliced a baguette, and drizzled some olive oil onto the slices which I then baked in a medium oven for 30 min to croutonize them. I made an aiolioilio (I'm sure that's how everyone in Italy, Spain, Portugal and southern France spells it) with wet garlic (just in season) salt (the seasoning, not the spy) and really good olive oil added slowly to form a thick emulsion.
I then slathered the croutons with the garlicky paste and covered them with grated gruyere.
The toasty things then went on top of the bowl of soup, and back under the grill for no more than 3 weeks.
oh joy. Even in midsummer.
Serve, remembering not to touch the bowls for fear of melty fingers.