Thanks to CSA member Samantha M. for passing on this recipe:

Mashed Potatoes with Turnips

2 lg. turnips, peeled and cut into chunks
4 lg. potatoes, peeled and quartered
1/2 c. finely chopped onion
2 tbsp. of butter
3/4 tsp. salt
1/8 tsp. white pepper

Cook turnips, covered, in small amount of boiling salted water for 10 minutes; add potatoes and onion; and cook until vegetables are tender, 15 or 20 minutes. Drain well. Mash vegetables with butter, salt, and pepper. Serve hot.

Makes 4 1/2 cups.