Bring a large pot of salted water to a boil and cook the brown rice pasta according to package directions until al dente.
During the last 2 minutes of pasta cooking, add the trimmed asparagus pieces to the boiling water to blanch them until bright green.
Drain the pasta and asparagus, reserving 2 tablespoons of the cooking water for the sauce.
In a large skillet over medium heat, melt the grass-fed butter with the extra virgin olive oil.
Add the shrimp to the skillet in a single layer, seasoning with sea salt, black pepper, and red pepper flakes.
Sear the shrimp for 2 minutes per side until pink and opaque, then stir in the minced garlic for 30 seconds until fragrant.
Add the cooked pasta, asparagus, and reserved pasta water to the skillet, tossing everything together to coat in the garlic butter sauce.
Remove from heat, squeeze fresh lemon juice over the top, and garnish with chopped parsley before serving.