Just before the pasta is ready, place the butter, garlic and half the lemon zest in a skillet over medium heat. If you are feeding a few, use a pot instead. Melt the butter and cook the garlic to remove the raw flavour. You don't want to brown it, just soften the flavour.
Add 2 tbsp of the lemon juice, and the grated parmesan cheese in with the pasta and butter. Toss everything till well coated.
Taste. Do you want more lemon zest? More pepper? More parm? Go for it!
Plate and garnish with more parm, lemon zest and herbs as desired.
Bake in the oven till softened and just starting to brown. They don't need to char, but they do need to be easy to pierce with a fork and are pleasant to eat. The tomatoes should be ready to burst, they should already be blistering. This may take about 25 minutes or so. Take out of the oven.
If making the Pasta Primavera, use a pasta that will balance the vegetables: farfalle, penne, bucatini, anything with substance will work better than say angel hair pasta.
Primavera Vegetables: use fresh asparagus, fava beans, ramps, yellow zucchini, cherry tomatoes, broccoli, spring peas, snow peas, green beans, etc. Remove any woody stems or ends. Cut larger vegetables into bite sized pieces. Radishes, brussels sprouts etc should be trimmed and quartered if on the larger size. Longer veggies like beans and asparagus should be cut into 1 inch lengths. Just make sure everything is in large bite sized pieces, they will shrink slightly as they roast in the oven.
Add grilled shrimp, leftover rotisserie chicken, even canned fish like tuna or sardines for a fun meal.