the recipe below was copied off of a ny newspaper's website. to the best of my knowledge, all listed ingredients are available in brands that have a hechsher. it sounds delicious, but it also sounds like a bit of work for a grilled cheese sandwich. maybe, with a few shortcuts, on a sunday morning...
Recipe: Milk Truck 3 Cheese Grilled Cheese with Balsamic Glazed Onions & Sautéed Mushrooms
Serves: 4
Ingredients
1 medium yellow onion
6 tablespoons cultured
butter
Olive oil
3 tablespoons good balsamic
vinegar
Salt
Pepper
4 ounces cremini mushrooms
1 teaspoon fresh thyme
leaves
½ lemon
8 slices of rosemary Pullman
bread
4 ounces aged domestic
Gruyere
4 ounces aged cheddar
4 ounces creamy blue cheese
Instructions
Remove skin of the onion, cut in half and slice into ¹/8" slices.
Heat a large skillet over medium high heat. Add 2 T. butter and a little olive oil. When the butter has melted, place the onions in the pan, and sauté until they soften and begin to caramelize, 3 or 4 minutes.
Stir in the balsamic vinegar and continue to cook until the onions are syrupy and there is very little liquid in the pan. Add salt and pepper to taste. Remove from pan and cool.
Clean and slice the mushrooms. Heat a large skillet over medium heat. When hot, add 1 T. of butter and 2 T. of olive oil. Add the mushrooms and thyme. Sauté the mushrooms for a few minutes until browned. Season to taste and remove from heat. Squeeze a bit of lemon juice over the mushrooms and set aside.
Heat a panini maker or a ridged, cast-iron pan over medium heat. Put a thin layer of butter on the outside of the bread slices. On the unbuttered side, add 1 ounce of Gruyere, cheddar and blue to four slices of bread. Spoon a generous amount of onion and 1 T. of mushrooms on top of the cheese. Cover with the remaining bread slices so that the buttered sides are facing out.
Place sandwiches on the grill and cook until the bread is crisp and the butter is melted.
If using a cast-iron pan, place another slightly smaller pan on top of the sandwiches to weight them down. Turn after a couple of minutes and repeat.



