Grilled Ham and Gouda Sandwiches with Frisée and Caramelized Onions
['1 tablespoon extra-virgin olive oil', '1 large onion, thinly sliced', 'Unsalted butter, room temperature', '4 1/3-inch-thick slices country white bread or sourdough bread', '4 ounces thinly sliced smoked ham, divided', '3 ounces Gouda cheese, thinly sliced, divided', '2 large handfuls frisée', 'torn into bite-size pieces (about 1 cup)', 'divided']
Heat oil in large nonstick skillet over medium heat. Add onion; sauté 5 minutes. Reduce heat to medium-low; cover and cook until onion is very tender and golden, stirring frequently, about 25 minutes longer. Season with salt and pepper. Cool slightly.
Butter 2 bread slices. Place bread, buttered side down, on platter. Divide onion, ham, cheese, and frisée between bread slices. Top each with another bread slice; butter top slices.
Heat another large nonstick skillet over medium heat. Add sandwiches and cook until bread is golden brown and cheese melts, pressing occasionally with spatula, about 4 minutes per side. Cut sandwiches in half diagonally and serve immediately.
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