Toss pecans, pumpkin seeds and sunflower seeds into a bowl, and cover them by 2 inches with warm water. Allow them to soak for 4 to 6 hours, drain and rinse well. If you're in a bind, you can substitute sprouted or roasted nuts and seeds.
Place soaked pecans, pumpkin and sunflower seeds and garlic into your food processor. Pulse 3 to 4 times until just combined. Toss in mustard greens and sea salt and pulse for a few seconds.
Turn the food processor on and slowly drizzle olive oil into the seeds and greens until it forms a smooth and uniform paste. Serve immediately or transfer to mason jars, cap with additional olive oil and refrigerate for up to a month.