"It was quite unexpected," she said of her double world record. "I would have been happy with a [two minutes] 27 but a 25, I'm absolutely stoked. I did all the hard yards before I came here and that's exactly what I wanted to go out and do."
Pascoe, who is a below-the-leg amputee, admitted it was special to claim New Zealand's first gold medal at the Paralympics and thought she might treat herself with a dessert. But she hopes to dine out on more success in London and wasn't getting too carried away.
"My main focus now is the next five races," she said. "I came here for six and this is just one so bring on the next five.
"We came here to do the job. We've got a team of 24 athletes and we're all striving to do personal bests. That's what I came here to do, but to get on the podium is special.
"It probably won't sink in until the end of the competition."
Southorn, who has a limb deficiency in her left arm, picked up New Zealand's first medal with bronze in the C5 individual women's pursuit.
The 44-year-old, competing in her third Paralympics, improved her personal best set in her heat in the morning by five seconds and completely dominated her bronze-medal rideoff, beating Great Britain's Crystal Lane by seven seconds.
"I can't believe it, no, it's incredible," she said. "I'm getting faster with age, so bring on the next one."
Southorn will compete in the women's team sprint over the weekend.