Combine broccoli, 2 tsp oil, pinch of salt and red pepper on a baking sheet. Bake for about 20 minutes or until the broccoli is charred a bit. Stir after 15 minutes
While broccoli is baking, bring a large pot filled with water to a boil. Add salt and pasta. Cook pasta to al dente (about 10 - 15 minutes). Drain in a colander over a bowl and reserve about 1/2 cup of the cooking liquid
Heat the remaining oil and the garlic in a large skillet over medium heat. Cook about 2 minutes until the garlic is golden, stirring occasionally. Add in the cream and reserved cooking liquid, stirring constantly with a whisk.
Stir in the feta and continue to stir until feta begins to melt and sauce is thickened.
Add in broccoli, pasta and lemon rind and stir to coat.
Plate the pasta mixture. Sprinkle with black pepper and the flaked sea salt. Serve