Tucked into a corner of the Niwot Market grocery store, the modest Sachi Sushi spends most of the week serving up raw fish offerings. But on Sundays, owner Tsukasa Hibino cooks up a batch of authentic, Kyushu-style ramen that's better than anything you'll find along the Front Range. Cloudy tonkotsu broth, made by boiling pork and chicken bones for hours until the liquid is infused with heady flavor and velvety collagen, holds a mass of springy noodles, dense enough to balance a bevy of ingredients near the surface: cuts of fat-laced pork, strips of black seaweed, half a hard-boiled egg, bits of scallion, a sprinkling of sesame seeds and a star-shaped slice of pink-swirled narutomaki, a fish cake that adds more color than flavor to the bowl. The result is deeply aromatic and savory, the noodles fattening as they soak up liquid, your lips getting sticky with fat as you slurp the soup.