When summer attention turns to berries, peaches, corn and tomatoes, it is worth making room for onions. Walla Walla Sweets are a heritage variety grown in southeastern Washington, prized for their mild flavor, high moisture and unusually gentle bite.
They are best treated as a fresh-market ingredient rather than a storage onion. Their season is limited, their skins are tender, and careful handling matters from field to kitchen. Use them while they are bright and firm: raw in salads, grilled beside sausages, or slowly cooked until they become almost jammy.
Older than a summer trend
The variety’s history reaches back to the late nineteenth century, when seeds associated with Corsica arrived in the Walla Walla Valley. Local farming families developed the crop over generations, establishing a regional specialty whose identity remains closely tied to its place of cultivation.
That identity is not simply a matter of sweetness. The onions are known for a lower level of the compounds responsible for the sharp sensation in many yellow storage onions. Soil, climate, water and the timing of harvest all contribute to their character.
A crop that asks for care
Walla Walla Sweets are planted ahead of winter and continue growing when the season turns. Harvest begins in early summer and can continue into late August, depending on conditions. Their thin skins and high water content make them vulnerable to bruising, so much of the work remains careful and hands-on.
After harvest, the onions are cured only until their necks dry and the outer skin takes on color. They do not have the long shelf life of a typical storage onion. Keep them cool, dry and well ventilated, and plan to use them promptly.
The limited season is part of the point. A fresh Walla Walla Sweet has a clean, rounded flavor that works raw but also develops depth quickly over heat.
Four ways to cook a sweet onion
Grill
Cut thick rounds or wide wedges and brush them lightly with oil. Grill over a hot fire until marked, then move them to a cooler area to soften. They are excellent with grilled vegetables, fish or sausages.
Roast
Trim and peel whole onions, coat them with olive oil, salt, pepper and thyme, then roast at 425°F until browned and fork-tender. Their natural moisture keeps the center soft while the edges take on color.
Sauté
Slice thinly and cook in a hot pan with olive oil and a pinch of salt. When softened, add spinach or chard and let the greens wilt. The result is a quick side dish with enough sweetness to balance a savory main.
Caramelize
Cook thin slices over medium-low heat, stirring and scraping the pan regularly. Add salt once they begin to soften and continue until they are deeply golden and spreadable. Spoon them onto burgers, grilled cheese or pizza.
Whether eaten raw or cooked slowly, these onions are a reminder that seasonality can be specific: one valley, one crop and a short window worth noticing.