Cook spelt berries according to package directions. I find 1 part spelt to 1.5 parts water simmered for about 30-40 minutes usually does the trick, but your brand might be different. Once the spelt is cooked, set aside to cool slightly.
While the spelt is cooking, roast your onions.
Heat your oven to 200°C / 400°F.
Toss the onions with a bit of olive oil, salt, and pepper, and pop them in the oven for 20 - 30 minutes, until they are soft and golden brown.
Set aside to cool slightly.
In a large bowl combine cooked spelt, roasted onions, raw onions, pickles, olives, cherry tomatoes, and feta.
Drizzle lemon juice and olive oil over top of everything, sprinkle with fresh dill, and mix well. Taste and adjust seasonings if needed. You likely won't need any salt, but you may want a bit of freshly ground pepper.
Enjoy cold, or at room temperature.