To make pesto, process basil, pepitas, parmesan, garlic, oil, lemon juice and 1 tablespoon water in a food processor to form a thick paste.
Cook pasta in a large pot of boiling water for 9 minutes. Add broccoli and boil for a further 1-2 minutes, until pasta is tender. Reserve ½ cup of the cooking water, then drain pasta.
Return pasta and broccoli to same pot over low heat. Stir in pesto, capsicum and reserved pasta cooking water until well combined and hot.
Sprinkle with feta. Season with freshly ground pepper.