That seems to be a good guess but they say the average size is about 2 inches wide and tall but the green citrus are definitely larger than that. Measured 3 inches wide and tall. They're the size of the smaller pink blushed grapefruits that are sometimes sold in stores. The skin is also very smooth and glossy and each end of the citrus doesn't protrude.

Maybe an Oroblanco or Sweetie? Was it purchased? Where?

I'll have to ask them and let you know later. Most likely a generic Asian market but definitely purchased

If I had to guess it looks like a pomelo, but weird since I've never come across that type of pomelo variety in any supermarket in the U.S. (including Asian markets). They're almost always the big red Chandler variety, although once I did find a white-fleshed variety which I believed to be Reinking, the shape was smaller and more flattened.

I’ve heard oroblanco can be eaten green although mine were not good green. Maybe in your climate? It certainly could be an oroblanco by the looks of it and flavor description...?

Dave I've asked them and it was purchased at an Asian market. Apparently only one of the markets they got it from tasted really sweet and flavorful. The one I ate must've came from a different store because mine wasn't very flavorful but it wasn't bitter either. It's probably hard to tell when it is properly ripe lol!

Laura I've looked up pomelo hybrids and green pomelos with light/yellow flesh do seem to exist! It's very likely a pomelo hybrid, probably more pomelo in its nature.

Parker Turtle I think pomelos just suffer from less popularity compared to grapefruit so you don't see many varieties in most stores except in the Asian ones. I've seen the enormous yellow pomelos in Asian markets and the yellow skinned grapefruit looking types but these green ones are probably a recent introduction. I feel like I've been seeing more citrus varieties in the markets this year though so maybe they're just expanding and testing out the response to different citrus selection these days!

Could it maybe be a Jaffa Sweetie? even though that variety is not often found in the U.S.

(like Oroblanco, it is a grapefruit-pomelo hybrid, but the exterior rind often doesn't yellow all the way and remains green)

So they bought more of this citrus and there's finally sticker labels on them!

PLU code 4296 is grapefruit. The sticker further identifies it as "cocktail"; and that sticker is usually applied by the grower or the packer; so I guess you have a cocktail grapefruit, which a pretty good one. I would still choose Oroblanco over it.

Yeah I tried looking online about the grower or packer. It seems it's just the packing company so I can't get any further information about the fruit. It has no bitterness to it so it's possible it's not actually a grapefruit but a pomelo crossed with a different citrus. I'll take your word for it about the Oroblanco though :)

Cocktail Grapefruit is another name for a Mandelo.

To quote from Wikipedia:

The mandelo was developed in the 1950s at the UC Citrus Experiment Station, but then escaped into public orchards.[1][3] It is a white-fleshed tri-specific citrus hybrid between a 'Frua' hybrid mandarin ('Dancy' mandarin × 'King tangor')[4] and a Siamese Sweet pommelo.[3] This makes it 1/4 King tangor, 1/4 Dancy tangerine, and 1/2 Siamese Sweet Pommelo.[3][5] It is named for its ancestors, mandarin and pommelo.

Further details see:

Wiki Mandelo

The packer is the only one who would know from what grower or what grove the fruit originated; there is a special code put on each box for that; and the information is not readily available to the public

Oh wow thanks for the tip John! Maybe I'll get to see them in their box some time if I go when they're stocking heheh

Thanks citrange! I read the same thing on the UCR site about the fruit. I think I'll stick with calling it a Mandelo. Cocktail is too confusing but Mandelo is a great reference to its parentage

Most here know that I am not a fan of UCR or its "Ivory Tower Knowledge"; in the real world, it is a Cocktail grapefruit; and that will be the name by which the consumer will recognize it.