Prep all ingredients to ensure a smooth cooking process.
In a small skillet, heat olive oil over medium heat. Add panko breadcrumbs and toast until golden brown. Stir in lemon zest, salt, and pepper, then set aside.
Bring a pot of salted water to a boil. Cook tagliatelle according to package directions. Add green beans halfway through cooking. Drain, reserving about 1/4 cup of cooking water.
In a skillet, heat olive oil over medium heat. Sauté shallots for 2 to 4 minutes until soft. Add garlic and cook for another minute. Add shrimp and chili flakes, cooking until shrimp are pink and opaque, about 3 to 5 minutes.
Add frozen peas, seasoning with salt and pepper. Lower heat, then stir in butter, lemon zest, and lemon juice until combined.
Add drained pasta and green beans to the skillet, tossing to combine. Gradually add reserved pasta water until a glossy sauce forms.
Serve immediately, topped with pangrattato for added crunch.
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Notes
Store leftovers in an airtight container in the fridge for up to 2 days. Reheat gently on the stove, adding a splash of water or butter to loosen the sauce.