This flavorful salad makes a delicious lunch or summer supper when spooned over crisp lettuce leaves, stuffed into a juicy, ripe tomato, or spread between slices of whole wheat bread.
Combine first 4 ingredients in a large bowl. Add mayonnaise, sour cream, lemon juice, salt, and pepper, mixing well. Cover, and refrigerate until ready to serve.
To serve, spoon about 1 tablespoon chicken salad on each cracker round and garnish with fresh tarragon leaves.