Toast hazelnuts (good to do a big batch ahead of time!). Roughly chop.
Steam broccoli: fill a saucepan with a few inches of water, fit with a steamer basket, bring to a simmer. Add broccoli florets, sprinkle with sea salt, and cover for about 5-7 minutes until bright green. You should be able to easily pick up with a fork.
In another saucepan, heat up olive oil over medium heat, add garlic cloves and stir occasionally until garlic turns golden brown.
Take off heat, add lemon juice, a sprinkle of salt, and chopped toasted hazelnuts. Stir to combine.
Place broccoli in a serving bowl, pour oil and nut mixture over broccoli and enjoy!