Cook 2 sliced garlic cloves in 1 tablespoon olive oil in a skillet over medium heat until golden, 1 minute. Add 1 bunch roughly chopped escarole and toss. Cover and cook until just wilted, 2 minutes. Combine 2 tablespoons olive oil with a pinch each of red pepper flakes and salt; add the zest of 1/2 lemon and the juice of the whole lemon. Toss with the escarole and season with salt. Top with chopped toasted hazelnuts and grated parmesan.