Heat 2 tablespoons olive oil in a large skillet over medium-high heat. Add in red onion and asparagus and saute 5 to 7 minutes until asparagus is tender crisp.
Add in peas, tomatoes, and artichoke hearts and stir briefly until heated through, 1 to 2 minutes.
Add in garlic and cook 1 minute more. Remove from heat.
Add in pasta and toss with 2 tablespoons olive oil, lemon juice, and parmesan until cheese is melted. Season with salt and pepper to taste. Serve hot with freshly chopped parsley to garnish.
If you love a really creamy sauce, you can easily turn this into an extra creamy pasta primavera by adding 1 cup of heavy cream to this recipe. Allow it to heat through and then add the lemon juice and parmesan cheese and stir until melted.