Bring 2 liters of salted water to a boil. Add the rotini. Cook on medium heat, uncovered for 12-15 minutes.
While the pasta is cooking, heat the olive oil in a pan on medium high heat.
Sautee the garlic for 1-2 minutes.
Before the garlic begins to brown, add spinach and cook until just wilted. Add a generous pinch of salt, then remove from heat.
Drain the rotini. Transfer to a large pasta serving bowl. Toss with spinach and garlic, hulled hemp seeds, and hemp oil. Sprinkle with freshly ground pepper. Serve with slices of tomato or avocado.