Whisk together the chickpea flour, water, cumin, and olive oil. Cover container and let rest for 2-3 hours at room temperature.
When ready to cook Socca, preheat broiler. When broiler is hot, brush cast iron griddle or frying pan with olive oil. Heat under the broiler for 2-3 minutes, then remove from oven and pour on a thin layer of batter.
Cook Socca under the broiler until it has firmed and browned, especially on the edges -approximately 2-4 minutes under the broiler. Continue to make Socca pancakes like this, brushing the griddle with oil and heating it between each one.
Cut finished Socca into rough triangular pieces, sprinkle with sea salt and fresh ground black pepper and drizzle with olive oil. Serve hot.