1.   Cook the onions until they go soft.

2.   Heat the oil in a frying pan and cook the onion until soft and beginning to brown at the edges.

3.   Melt the butter in a small saucepan and cook the onion until soft and transparent.

4.   Cook the onions over low heat.

5.   And this woman was absolutely maniacal about the proper way to cook onions.

6.   Add the remaining oil to the pan and cook the onions over moderate heat until tender and translucent.

7.   Cook onion in bacon fat, stirring constantly, until soft.

8.   Cook onion in vegetable oil until tender.

9.   Cook the onion, stirring from time to time, just until it becomes translucent.

10.   Cook the onions slowly until soft but not darkened.