Fill a large pot with 1 inch of water and bring to a simmer. Pour in the raw peas and steam for 2 minutes. Remove from heat, strain through a colander and set aside.
Break the tough ends off the asparagus and compost them. Then using the same large pot, fill again with 1 inch water, bring to a simmer and steam the asparagus for 3 minutes. Use tongs to remove the asparagus to a plate. Set aside.
Sprinkle the sliced onion with salt and sauté in olive oil over medium heat for 3-5 minutes. Make sure the onions cook until translucent, not browned.
In a large bowl, toss together the peas, onion and pancetta. Top the asparagus with this mixture. You can drizzle more olive oil if you like too.