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Thinly sliced baguette topped with a bit of mustard, a mound of caramelized onions, and a sprinkle of gruyère.
Peel onions and chop in half. Lay each half of the onion flat side down and slice onion in 1/4″ slices. Separate layers of the slices so you end up with about 6 cups of half-moon shaped pieces from 3 medium size onions.
Heat butter in a large frying pan until melted and add onions. Sauté for 5-10 minutes until onions begin to soften. Add salt, pepper, vinegar, and Worcestershire sauce and place heat on medium. Cook onions for another 30 minutes or so, stirring often, until onions are very soft and cooked through.
While onions are cooking, preheat oven to 375°F and line 2 cookie sheets with parchment paper. While onions are cooking, slice baguette on the bias in slices a little less than 1/2″ thick. Spread one side of each piece of baguette with a thin layer of mustard and place on the cookie sheets, mustard-side up, fitting as many onto each pan as you can.
Once onions have caramelized, place some onions on top of each piece of baguette, enough to include onion in each bite. You can add more or less to taste, depending on how many onions you chopped. Sprinkle a tablespoon or two of grated cheese on top of the onions on each piece.
Bake crostinis in the oven for 15-20 minutes or until cheese has melted and begun to bubble. You can also finish with a minute or two under the broiler, but keep a close eye on them to make sure they don’t burn. Serve warm!
Nancy is the Coupon Clipping Cook, which means she not only has an astounding number of recipes to share with us (her TK recipe box is busting at the seams!) but she's also got loads of money-saving tips in her blog (she worked at a grocery store for a number of years, so she knows her stuff). She has some pretty amazing creations, like Roasted Garlic Potato Soup and Nutty Coconut Chicken. Go check them out!
Heather is a Texas native and the blogger behind Heather's Dish. She's mom to Weston, wife to Nate, and they live in Little Rock, Arkansas with their two "stubborn and saucy" dogs Bunker and Keira. In her blog, she shares her photographs, random musings (serious and silly alike), and all kinds of scrumptious recipes---and not just evil variations of her favorite mac and cheese. Her enviable TK recipe box is a testament to that. Go see for yourself!