Heat the oil in a large pot over medium-high heat. Add the onion and cook for about 5 minutes, until it begins to brown.
Add the garlic, ginger, curry paste, red pepper flakes, cumin, black pepper, and sea salt, and cook for another 2 or 3 minutes, until the mixture becomes fragrant.
Add the tomatoes, coconut milk, chickpeas, to the pot and bring to a boil. Reduce the heat and let simmer for about 10 minutes.
Add the spinach to the pot and stir until it’s wilted.
Add the lemon juice and give it one last stir.
Serve hot over baked sweet potatoes, baked russet potatoes, cooked brown rice, or cooked rice noodles.