Heat the olive oil in a large pot or deep skillet over medium heat.
1 tbsp olive oil
Add the shallot and sauté for 2–3 minutes until softened. Stir in the garlic and red pepper flakes and cook for another 30 seconds until fragrant.
1 shallot, 2 cloves garlic, ½ tsp red pepper flakes
Pour in the white wine, bring to a simmer, and cook for 2 minutes to reduce slightly.
½ cup dry white wine
Stir in the diced tomatoes, lemon zest, lemon juice and black pepper. Simmer for 7–8 minutes to let the flavours meld and slightly thicken the sauce.
¾ cup tomatoes, ½ lemon, ½ lemon, 1 pinch pepper
Add the cleaned mussels to the pot, cover with a lid, and cook for 5–7 minutes, shaking the pan occasionally, until the mussels open.
2 lbs mussels
Discard any mussels that did not open.
Finish with a squeeze of lemon juice and sprinkle with fresh parsley. Give it a final gentle stir and serve immediately.
2 tbsp parsley