Turnips are fantastic roasted with other root veggies - potatoes, parsnips, carrots, sweet potatoes. Just dice them the same size as the other root veggies and roast for an hour at 375 with evoo, rosemary, salt and pepper.
They also are good pureed in soup with the above mentioned root veggies.
Sorry, but everytime I’ve roasted turnips, everyone in this family picks them out, and they get thrown away in the end. So that’s not a choice. Or putting them in any kind of soup…unless someone has a recipe that totally hides the taste of the turnip.
I love fennel. The Italian tradition is to eat it raw at the end of dinner to help with digestion. Cut off the top - just leaving the bulb part. Wash well, quarter it, and take off any brown outer pieces. Then eat the “leaves”.
A chef friend of mine substitutes turnips for anything that’s heavy potato- fewer calories and a lighter texture. So mashed potatoes- use 1 turnip for every four potatoes-- they will be light and airy and assuming you use your usual seasoning, nobody can taste the turnip. Add a little more garlic to the mashed potatoes (or use very fresh Italian parsley) and nobody will know.
I have a few fennel salad recipes. Slice the fennel really thin, it works well with arugula or any bitter/strong lettuce. Slice a few ripe pears. Garnish with toasted cashews, craisins, and a very lemony dressing made with fresh lemon juice and a good olive oil. You can google “salads with fresh fennel” to get a few other ideas. But because fresh fennel has its own strong flavor, all you need is lemon, salt and olive oil for a dressing. Quick and refreshing salad with a heavy meal.
I also serve it roasted-- cut the bulbs into quarters, toss with olive oil, salt and pepper on a cookie sheet. When it browns a little it will carmelize-- such a great garnish/side for a simple baked or broiled fish.
My mom would always fix carrots and turnips - mashed together with a lot of butter - for Thanksgiving, Christmas, and winter Sunday dinners. It was common when she was growing up in England.