Melt butter in a small skillet for several minutes on medium-low heat.
As butter melts and begins to darken slightly, add sliced almonds.
When almonds are just turning golden, remove from heat.
Place prepared green beans in colander over boiling water and steam, covered, for 5-10 minutes.
When green beans are still bright green, barely fork tender, remove from heat.
Drain and place in serving dish.
Pour browned butter and toasted almonds over the green beans.
Sprinkle lightly with sea salt.
Serve immediately.