Preheat the oven to 200 degrees Celsius.
Wash the potatoes and place them on a baking tray lined with tin foil or a baking sheet. Prick some holes in sweet potatoes with a fork.
When the oven is ready, pop the sweet potatoes in for about 45-60 minutes. Check them around the 45-minute mark by piercing them with a fork to see if they're ready.
While the potatoes are roasting away, make the pasta. Boil a pot with hot water. Add the pasta and cook for about 6-8 minutes (depending on your pasta brand).
Make the hemp seed & pecan nut sauce by mixing the pecan nut butter, nutritional yeast, lemon, hemp seeds, soy sauce and water in a small bowl. Mix until smooth. Add more water to create a thinner consistency if needed.
Toast the walnuts over a high heat over the stove until lightly browned. Toss them frequently to ensure even toasting.
Take the sweet potatoes out the oven and cut length ways down the center. Fill the middle with the pasta, a dollop of the sauce and a sprinkle of nuts. Top with fresh coriander, peppery rocket and a squeeze of lemon.