Bring a large pot of salted water to a boil.
Add lumache pasta and cook until al dente, according to package instructions.
Reserve 1 cup of pasta water, then drain the pasta and set aside.
In a small bowl, combine saffron threads with a splash of warm water and let it sit.
Heat extra virgin olive oil in a large skillet over medium heat.
Add minced shallot and sauté for 2–3 minutes, stirring until soft and translucent.
Stir in ’nduja sausage and cook until it melts into a spreadable texture, releasing its flavorful oils.
Stir in minced garlic cloves and sauté until fragrant, about 30 seconds.
Add tomato paste and cook, stirring, until it turns a deep golden brown, about 1–2 minutes.
Pour in heavy cream, fresh lemon juice, and the bloomed saffron (including both the liquid and threads).
Stir well to combine.
Reduce the heat to medium-low and let the sauce simmer for about 7 minutes, stirring occasionally.
The sauce should thicken slightly and develop a rich, creamy consistency.
Add the cooked pasta to the sauce, tossing to coat evenly.
Stir in Pecorino Romano, adding a splash of reserved pasta cooking water as needed to achieve a silky, smooth texture.
Divide the pasta among serving bowls. Garnish with more Pecorino Romano, a drizzle of extra virgin olive oil, and fresh basil leaves. Serve immediately and enjoy!