2Wrap the beet tightly in aluminum foil and place the foil packet on a rimmed baking sheet. Bake until the beet is fork tender, about 1 hour. Cool, then slip off the skin, and cut the beat into cubes.
3Meanwhile, place the eggs in a medium pot and fill with water to cover by 1 inch; bring the water to a boil. Immediately turn off the heat. Cover the pot for 3 minutes. Uncover and let the eggs cool in the water. Peel and halve lengthwise.
4Bring a large pot of salted water to a boil. Fill a large bowl with water and ice. Boil the asparagus until crisp-tender, 1 to 1 1/2 minutes. Plunge immediately in the ice water; drain well.
5GRILLED RED ONIONS:
Roughly chop the onions and toss with the olive oil. Spread the onions onto a rimmed baking sheet and broil until golden brown, about 5 minutes.
In a bowl, whisk together the vinegar, salt, oregano, and thyme until the salt dissolves. Whisk in the mustard. Whisking constantly, slowly drizzle in the olive oil until fully incorporated. Season with salt and pepper to taste. The vinaigrette will keep in the refrigerator, covered, for up to 1 month.
7Divide the romaine among 4 dinner plates. Scatter the beets, carrot, tomato, cucumber, olives, and onions over the romaine (like a pizza pie). Cross two asparagus stalks over the top of each salad. Top each with two egg halves and a marinated artichoke heart. Drizzle with vinaigrette and garnish with chives. Serve immediately.