For hazelnut butter, in a small saucepan, melt butter over medium-high heat. Add nuts and cook until butter begins to brown and nuts just start to turn golden, about 3 min. Remove from heat and let cool slightly.
In a large nonstick skillet, bring ¾ cup water to a boil over medium-high heat. Add broccoli and cook, turning occasionally, until just tender, 8 to 10 min. Using tongs, transfer to a platter. Stir together nuts, butter, salt and zest; spoon over broccoli.
Tip: Baby broccoli is dark green with tender long stems and tiny tree tops. If you can’t find it in your market, broccoli rabe is a great substitution. I like the mild flavor of baby broccoli though, so I suggest you ask your grocer to order it!