Rinse farro. Combine water and farro in medium saucepan so that water covers the grains. Bring to a boil. Reduce the heat level to medium and cook for 20-30 minutes, until farro is tender. Drain well.
Whisk olive oil and red wine vinegar together in the bottom of a large bowl. Season with salt and black pepper. Add warm, drained farro and toss. Leave at room temperature to cool while preparing lima beans and peas.
Meanwhile in same medium saucepan, cook lima beans according to package directions. (I simmered mine for about 14 minutes.) During the last minute of cooking time, add the peas and cook for just one minute. Drain and refresh with cold water to cool the legumes down and keep the bright green color. Drain well. Add limas and peas to farro.
Add tomato pieces, parsley, basil, and green onions to farro mixture, tossing to distribute evenly. Sprinkle lemon juice over and mix together.
Add about half of the spinach leaves. Toss to combine and taste for seasoning, adding more salt, pepper, lemon juice, or vinegar, if needed.
Line serving dishes with remaining spinach leaves and serve salad over them.