Heat the olive oil in a skillet over a low/medium heat. Thinly slice the onion and garlic. Add the onion and garlic to the skillet. Sweat gently until tender and fragrant.
Step 2
Add the diced tomatoes and lemon zest to the skillet. Roughly tear the sardines. Add the sardines to the skillet. Mix well to combine. Simmer over a medium heat for 5 minutes to cook through.
Step 3
Add the baby spinach to the skillet. Stir well. Allow the spinach to cook through until just wilted.
Step 4
Make two wells in the mixture. Crack an egg into each well. Cover with a lid and let the eggs cook through to your preference. Scatter over the chili flakes and chopped fresh parsley to serve.