Bring a pot of water to a boil.

Add wheat berries to the boiling water and cook for 1 to 1 1/4 hours, or until tender.

Drain the wheat berries in a sieve and rinse under cold water to cool.

Drain the wheat berries well.

In a large bowl, whisk together red-wine vinegar, salt, and pepper.

Slowly add olive oil while whisking until the dressing is combined.

Add the cooked wheat berries, thinly sliced red onion, and chopped fresh dill to the bowl.

Stir until all ingredients are well coated with the dressing.

Serve immediately or chill for later.