Heat a large skillet over high heat and saute ham steaks 4 to 5 minutes on each side. Remove to a plate and keep warm while you make the sauce.

Add butter and onions to skillet and cook until onions are softened, scraping up any browned bits on pan bottom. Add flour and stir well to combine. Cook for 1 to 2 minutes, then add coffee and chicken stock. Whisk well to combine, then allow sauce to cook until thickened, about 6 minutes. Add green onions and heavy cream and cook 5 minutes longer. Season with salt and pepper, to taste, and serve over ham steaks with buttermilk biscuits

Preheat oven to 375 degrees F and line a baking sheet with parchment paper.

In a large bowl, combine dry ingredients and blend thoroughly. Using your fingers or a pastry blender, cut in butter until mixture resembles coarse crumbs. Add buttermilk and quickly blend in, making sure to not overwork the dough.

On a lightly floured surface, roll out the dough with a rolling pin to a thickness of 1/2-inch. Use a biscuit cutter or the rim of a glass, press out as many biscuits as possible. Gather up scraps and quickly knead back together, then cut out as many additional biscuits as possible. Place biscuits on prepared baking sheet and bake until golden brown, about 15 to 20 minutes. Serve immediately.