Preheat oven to 375 degrees F (190 degrees C).
In a skillet, heat a splash of olive oil over medium heat, add thinly sliced Onion (2) & cook over medium low heat for about 15 minutes, stirring often until softened & nicely caramelized.
Add caramelized onions to a 9x13 inch baking dish along with Canned Chickpeas (30 ounce), Extra-Virgin Olive Oil (2/3 cup), Preserved Lemon (2), Fresh Rosemary (3 sprig), Crushed Red Pepper Flakes (1/2 teaspoon) and Salt (1/2 teaspoon) - stir to combine.
Roast in the oven for 15-20 minutes and then serve hot, warm or even at room temperature. Enjoy!