Preheat oven 400 degrees F.
Add 1/2 Tbsp. olive oil to 9x13 baking dish and spread with a paper towel to coat the inside of the dish.
Chop asparagus into 2 inch pieces and add to baking dish. (Discard tough white ends.)
Chop onion into large chunks and add to baking dish.
Core apple, chop into chunks and add to baking dish. (No need to peel unless it’s not organic.)
Drizzle 1/2 Tbsp. olive oil over chopped veggies.
Sprinkle with sea salt and ground black pepper to taste. (I use about 1/4 teaspoon each.)
Use a spatula to stir the chopped veggies until lightly coated with oil.
Place baking dish in oven and roast until veggies reach desired tenderness. (About 20 - 30 minutes - stirring every 10 minutes.)
Squeeze 1/4 fresh lemon over veggies and stir to mix.