Before I get into the how-to let me tell you that, yes, I understand that what looks like pureed green mush might not appeal to everyone. But this isn't mush - the spicy arugula, sweet peas, and walnuts when properly seasoned with a good pinch of salt and fresh cracked pepper and whirled in the food processor with a drizzle of olive oil turn into something YUMMY.
The shrimp was simply grilled with salt and pepper. I made the polenta last night and spread it on a small pan to chill so I could grill it today. If your shrimp and peas are defrosted this meal could come together in 20 minutes flat.