Gary Soto did not write a poem specifically about oranges. He wrote a poem called "Oranges" which is about a boy taking his girlfriend to the movies and buying her an orange, but it is not about oranges themselves. The poem is more about a young boy's attempts to impress a girl and his anxieties about being awkward and inadequate.
Here's a part of the poem:
> I peeled the orange
> and gave her a segment.
> "It's good," she said,
> "but it's too cold."
If you're interested in reading the poem, you can find it online or in anthologies of Soto's work.