Joshua Henderson teamed up with Dani Cone of High 5 Pie and Jon Milazzo and Lori Pomeranz of Retrofit Home to open landlubbing Cone & Steiner, an old-school mercantile filled with modern staples on Capitol Hill’s budding 19th & Mercer corner. The market is a haven for hands-on shoppers: There’s a grind-your-own-flour station, five taps for filling growlers, and the basic provisions neighborhood folks need to fix everything from dinner to doorknobs.