Preheat the oven to 350F. Line a baking sheet with parchment paper.
Add seeds, fennel, paprika, oil, and salt to the baking sheet and toss to coat (I like these nice and salty and use ½ teaspoon since they are being used as a topper, but you could tone it down with ¼ teaspoon). Bake for 8-10 minutes, stirring halfway through, or until the seeds are toasted and fragrant. Remove and let cool.
In a large pot, add the brown rice and enough water to cover by 3-inches. Bring to a boil over high heat, then reduce the heat to medium to maintain a gentle boil for 30-35 minutes, or until the rice is cooked through, stirring occasionally. Drain thoroughly, then transfer back to the pot (make sure all of the water is out of the pot).
In a high-speed blender, add the spinach, herbs, hemp, water, lemon, miso, oil, garlic, and salt. Blend until totally smooth (start slow, then slowly increase the speed). If too thick to blend, add a splash of water. Pour the sauce over the rice and mix to coat (scrape off every last bit!).
Serve the rice topped with plenty of seeds (¼ cup per person, load it up!) and lots of pickled red onions.