Made this for Thanksgiving. Loved Chef John's video tutorial. "2 Large yellow onions" was hard to judge for me. Here in TX we grow 'em BIG. I ended up using 2 pans to caramelize the plethora of onions. Still, I used them all in the dish, when one of those biggies would have sufficed. I used 1% milk and slightly less flour (my hand guesstimate was off). It didn't thicken quite as much as I thought it would. This could be due to my flour mismanagement or the 1% milk. It worked fine in the dish, it just didn't give that soupy-creamy texture that is found when making the recipe using soup from a can. Also, didn't have sherry vinegar so just used sherry on the onions. Mmmm. The Panko and Parm-Reggi was delightfully tasty. The Gruyere added a nice bite and depth. However, that cheese is really pricey. I may make it with a less expensive brand next time. The flavor of this dish was as wonderful as I thought it would be. What with all the chopping of my BIG onions and the green beans, the caramelizing and sauce cooking, and cheese shredding, this recipe is a bit time consuming and labor intensive. But the end result is elegant, tasty and gave me pride that I didn't do the soup version of this classic casserole. Thanks Chef John!
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Made this for Thanksgiving. Loved Chef John's video tutorial. "2 Large yellow onions" was...