Been growing Chironja here in Nipomo for about 15 years. Seeds were from Puerto Rico. Big tree like a grapefruit, green and full leaves. Fruit looks like a grapefruit. Grapefruit here on the cool CA coast are sour and bitter. Pummelo are better. Just picked a bunch of Chironja to juice and they are not quite ripe yet. Usable. Another month... We do not have the heat to have a real grapefruit, but the Chironja is a nice combination of orange and grapefruit and develops good sweetness during the year. Here it is more like a large orange, full of juice, peels like a navel orange. As good as a Temple Tangor, but larger fruit, more productive. An orange with a bit of grapefruit taste. One of my favorites. Frost concerns: it is never bothered, but our short-time low this year was 26 and damaged several 3 ft tall mangos (that I should have covered).