Combine wheat berries, 1 onion half, thymesprigs, and 1 tablespoon salt in a large saucepan;add water to cover by 2". Bring to a boil;reduce heat to medium and simmer untilwheat berries are just tender but still firm tothe bite, about 35 minutes.
Heat 1 tablespoon oil in a largecast-iron or other heavy skillet overmedium-high heat; add onions. Seasonlightly with salt and pepper. Cook, stirringoccasionally, until onions are charred inspots, about 5 minutes.
Transfer to bowlwith wheat berries.
Add 1 tablespoon oil tosame skillet. Working in 3 batches, add kaleand cook, tossing occasionally, sprinklingwith salt and pepper, and adding oil asneeded between batches, until charredin spots, about 1 minute per batch.
Addto bowl.
Drizzle with lemon juice and anyremaining oil; toss to coat. Season to tastewith salt and pepper.