In a pan with high sides or a dutch oven add ¼ cup olive oil. Add in red onion, garlic, crushed red pepper flakes, and sauté until a couple minutes before fragrant.
Then add in broccolini, red bell pepper, tomatoes, squash, and sauté on medium heat for 5 - 7 minutes. Once veggies start to soften add lemon zest, lemon juice, 2 tbsp olive oil, and white wine. Let that sauté for about 3-5 minutes to let the alcohol burn out.
To a pot of boiling water add tagliatelle and cook that until one minute before al dente.
Once your pasta is almost al dente add it to the pan along with ¼ cup of pasta water
Add in ripped fresh basil, butter, grated pecorino romano, and green onions. Toss everything together and let that simmer for about a minute or so.
Garnish with pecorino romano. ENJOY!