Fill a large pot with a steamer basket halfway with water and bring to a boil.

Chop all vegetables (potatoes, turnips, carrots, string beans and beets) into 1/2-inch pieces

Steam potatoes for about 7 minutes until tender, then transfer to a large bowl.

Steam turnips and carrots for about 5 minutes until tender, then transfer to the bowl.

Steam string beans for about 4 minutes until tender, then transfer to the bowl.

Steam frozen peas for about 1 minute, then transfer to the bowl.

Steam beets for about 8 minutes until tender, then transfer to a separate bowl.

Let all vegetables cool for 5 minutes.

Toss potatoes, turnips, carrots, string beans, and peas together in the large bowl.

Fold in mayonnaise and season with salt and pepper to taste.

Place one romaine lettuce leaf on four different plates.

Divide potato mixture between plates and sprinkle beets on top of each plate.

Serve immediately.