Everyday Food editor Sarah Carey shows you her simple poaching method that results in tender chicken every time – perfect for this hit-the-spot sandwich.
In a large straight-sided skillet or pot, cover chicken and onion with water by 1/2 inch; season generously with salt. Bring to a boil over high; cover, reduce heat to medium-low, and cook 5 minutes. Remove skillet from heat and let stand, covered, until chicken is cooked through (an instant-read thermometer should read 160 degrees), 12 to 14 minutes. Remove chicken from water and let cool completely. (To store, refrigerate in an airtight container, up to 3 days.)
Shred chicken, then mix with walnuts, raisins, celery, red onion, mayonnaise, yogurt, and tarragon. Make sandwiches with bread and lettuce.
Poached chicken is endlessly versatile. Try it tucked into tacos, stirred into soups, or tossed into salads.