Preheat oven to 350 degrees.: Close your oven and listen for the quiet hum as it warms, then set it to 350 degrees . A properly preheated oven ensures even roasting so the beets cook uniformly. You should avoid tossing them into an oven that has not reached temperature, because uneven heat leads to inconsistent tenderness.
Cut away and discard stalks. Wash beets and pat dry. Brush beets with olive oil and wrap individually in foil, place on a cookie sheet and bake approximately 1 hour, or until tender. Allow beets to cool at room temperature then peel the thin outer skin and cut into 1/4" slices. Store beets in an airtight container in the refrigerator until ready to use.: As you trim the beets , you may notice fresh, green stalk remnants; remove them and give the roots a good rinse. The tactile feel of smooth skin under cold water tells you they are clean. Leaving tough stalk bits can make roasting uneven and leave fibrous pieces in the finished slices.
Place endive in a salad bowl, top with beets, pistachios, and goat cheese crumbles.: Washing should reveal the beet's natural sheen, and patting them dry prevents excess surface moisture that would steam rather than roast. The sound of paper towel against the root is a tiny ritual that helps you avoid a bland roasted exterior.
Brush beets with olive oil and wrap individually in foil, place on a cookie sheet and bake approximately 1 hour, or until tender: The slick of olive oil helps the skin caramelize lightly, while wrapping in foil traps steam so the beets cook through evenly. You might hear a low crackle in the oven as moisture concentrates, a good sign they are roasting correctly. Check at about 50 minutes to ensure they are tender when pierced with a knife, because under roasting means a gritty bite and over roasting risks a dry texture.
Allow beets to cool at room temperature then peel the thin outer skin and cut into 1/4" slices: When you remove the foil, a warm, earthy aroma will rise. Letting them cool makes peeling easier; the thin outer skin should slide off with gentle pressure. Use a sharp knife to slice to uniform 1/4 inch thickness so each piece pairs well with the endive . A common error is peeling while too hot, which can burn your fingers and make the slices uneven.
Store beets in an airtight container in the refrigerator until ready to use: Once cooled, sealing the roasted beets preserves their texture and flavor. You will notice their color deepens in storage, and they will keep for several days chilled. Avoid leaving them out for long at room temperature, as that can dull their freshness and invite spoilage.
Place endive in a salad bowl, top with beets, pistachios, and goat cheese crumbles: Lay down the crisp endive first so it forms a bed, then arrange the warm or chilled roasted beets on top. Sprinkle with toasted pistachios for crunch and scatter the goat cheese crumbles for creamy pockets of flavor. Toss gently if you want a mixed salad, or compose it for an elegant presentation. One pitfall is over tossing, which bruises delicate leaves and makes textures blend rather than contrast.