Put the chicken stock, tomatoes, fusilli, sun-dried tomatoes plus the reserved oil, capers, garlic and onion in a large pot, then sprinkle with a pinch of salt and some pepper. Stir together. Cover and bring to a boil over high heat. Lower to medium-low heat and simmer, stirring occasionally, until the pasta is al dente and the sauce has thickened, about 25 minutes.
Place pasta on a large platter and dollop with ricotta. Garnish with olive oil, basil and more ground pepper.