What is the beefsteak tomato of the red-fleshed plum (Arvali)?

On Taiwan Provincial Highway 21 from Nantou to Yushan, at the midpoint of the route, there is a Bunun tribal village famous for its hot springs, "Dongpu Hot Spring." Dongpu Village has a total of 6 neighborhoods; those in the hot spring area are Dongpu neighborhoods 2, 3, 4, 5, and 6, while Dongpu neighborhood 1 looks across at them from the far side of the Salixian Creek. Separated by just one creek, the two banks look completely different. Especially at night, gazing from the quiet Dongpu neighborhood 1 toward the hot spring area with its flashing neon lights across the way, visitors can feel that contrast; for the residents of Dongpu neighborhood 1, it is an even more complicated feeling...

Because Dongpu neighborhood 1 lies within the boundaries of Yushan National Park, all construction is restricted, and no hotels can be built and no hot spring business can be developed. Although this means fewer tourists coming and going, it has also preserved the original simplicity. Most of the people of Dongpu neighborhood 1 still make a living from farming, with the main crops being snap beans, beef tomatoes, tea, and so on. However, Dongpu sits at an elevation of about 1,000 m, and the cold, humid environment is not suited to growing beef tomatoes, but today's protagonist, Arvali (which sounds a lot like the Taiwanese word for red-fleshed plum), was the first person in Dongpu to introduce greenhouse cultivation of beef tomatoes. Since taking over his father's tomato garden 8 years ago, he has moved all along toward a pesticide-free approach, and this year, with the assistance of Yushan National Park and the Tse-Xin Organic team, he has grown Dongpu's first batch of organically certified beef tomatoes (this year was the first time Dongpu neighborhood 1 applied for organic certification; in addition to Arvali, 2 other households also passed).