The point has been made on a thread about Kales that they all taste the same - so why grow several varieties when one will do? 
We know that a mix of varieties will extend the cropping season but, if we ignore that,.............my question is.......in your opinion which other vegetables or fruit "taste the same"? 

For me, its Leeks. There may be blue ones, yellow ones and green ones, some are early, some late, some overwinter, some crop in summer - but when it comes to eating them, they all taste the same.

Yellow Delight
Yellow Gazzi
Yellow Pear
Yellow Perfection
Yellow Stuffer
Yellow Pygmy
Yellow Submarine

Z
Zlatava

Whippersnapper
White Cherry/Snow white cherry
White Queen
White Zebra

Veranda Red
Vince

(That was easy!)

Unknown Black
Urban's Delight
Urbikany

Pantano
Paul Robeson
Peacevine
Peche Vilmorin
Pendulina
Pertseviddny
Pineapple
Pink Boar
Pink Brandywine
Pink Bulgarian
Pink Tiger
Pink Grape
Polish Linguisa
Pomme Rouge de Montpelier
Ponderosa Pink
Primabella
Primavera
Principe Borghese
Purple Plum
Purple Russian

Taiko
Tamina
Tangella
Tanana/Early Tanano
Tasmanian Chocolate
Thompson's Seedless Grape
Tigerella
Tiny Tim
Tsunshigo Chinese
Tumbling Tom Red
Tumbling Tom Yellow
Tumbling Tiger
Tutti Frutti F1

Salisaw cafe
San Marzano Red Plum
Santonio F1
Sgt. Peppers
Snieka Pika
Spanish Big Globe
Sparta
Speckled Roman/Striped Roman
Steak Sandwich
Stonor's Most Prolific
Stupice
Sub Arctic Plenty
Summer Cider
SunBaby
Super Marmande
Super Sweet 100
Sweet Aperitif
SweetBaby
Sweet Casaday

Old German
Oleron Yellow
Opalka
Orange Banana
Orange Jazz
Orange Queen
Oregon Spring
Otto's Papa
Outdoor Girl

Nectar Rose
Northern Lights