Soak cashews in water overnight, or in almost boiling water for 30 minutes. Drain.

Cook pasta according to package directions. Drain; reserve 1 cup pasta water.

Meanwhile, in sauce pan, combine shallots, garlic, olive oil, salt, pepper and red pepper flakes. Sauté 7 to 10 minutes.

In blender, blend together cashews, water, tomato paste, sautéed shallots and garlic until smooth.

In sauce pan, combine pasta water and sauce. Boil down until sauce has achieved thick consistency.

Stir together sauce and pasta until covered. Garnish with additional red pepper flakes.