Drain the jar of chickpeas well. Pat them dry and lightly crush roughly half with the back of a glass. This creates texture later on.
Heat the olive oil in a wide pan over medium heat. Add the chickpeas and cook until golden at the edges, letting some of them crisp slightly. Season lightly with salt, then set aside.
Bring a large pot of generously salted water to a boil. Cook the spaghetti until al dente.
Before draining, reserve at least one cup of hot pasta water.
In a bowl, whisk together the cashew butter, white miso, nutritional yeast, lemon juice and grated garlic.
Slowly add 120ml of hot pasta water, whisking constantly, until smooth and pourable. Add more water if needed — it should feel slightly looser than you expect.
In the empty pasta pan, add the freshly cracked black pepper and warm gently for 30–60 seconds until fragrant. This step is subtle but important.
Return the drained pasta to the pan with the pepper. Pour over the sauce and toss vigorously, adding splashes of pasta water as needed to create a glossy coating.
Fold in the crisped chickpeas and continue tossing until everything is silky and evenly coated.
Finish with a drizzle of good olive oil and extra black pepper.
Serve immediately.