Pre-heat oven to 400 degrees F.
Place broccolini on a lined baking sheet.
Add oil and salt on top of broccolini. Use clean hands to massage it in.
Place in the oven for 30 minutes or until tender and tops are slightly crispy.
Remove broccolini from the oven when finished roasting.
In a small pan on medium heat, add an additional tbsp of oil of choice. Add in mustard seeds and let them temper (they will pop).
Once the popping of mustard seeds starts to slow down, add in grated garlic and whole red chilies (break them in half). Let this all fry in the oil.
Once seeds have stopped popping and garlic and chilies are slightly browned, pour all of this directly on top of the roasted broccolini.
Serve immediately and enjoy!