Prepare the flaky pie dough by combining flour, butter, salt, sugar, and ice water. Mix until the dough comes together, then chill for 1-2 hours.
Caramelize endive and onions in olive oil until browned. Season with salt, pepper, white wine vinegar, and fresh thyme.
Roll out the dough into a rectangle, place on a baking sheet, and add grated Parmesan on top.
Spread the caramelized endive and onion mixture over the dough, leaving a border. Fold the edges over the filling.
Brush the edges with egg wash and sprinkle more Parmesan on top. Bake at 350°F until golden brown.
Prepare a vinaigrette with shallot, mustard, honey, salt, pepper, white wine vinegar, and olive oil for the salad greens.
Toss endive and radicchio with the vinaigrette, adding parsley and remaining Parmesan.
Once the galette is baked and cooled, cut it into pieces and top with the dressed salad greens.
Serve and enjoy the Caramelized Endive Galette as a main course or appetizer.
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