Don't loose hope! I've successfully satisfied the palates of allium sensitive folks with this culinary magic....
Fun-nions:
1 serving
1 medium fennel bulbs (sliced or diced like the onions your desire)
1/4 t Aseofetida (aka Hing, sold as an Indian spice)
1/4 t ghee (or oil of choice)
Sea salt to taste
Wet sautee the fennel bulbs (med high heat, adding small amounts of water to de-glaze often) until the desired caramelization (light caramelized brown is best). then add oil, salt and aseofetida to taste.
What is aseofetida?
http://en.wikipedia.org/wiki/AsafoetidaEnjoy!