400 grams pasta (penne, fettuccine, or your choice)",
2-3 tablespoons olive oil",
3-4 cloves garlic, minced",
1 medium onion, finely chopped",
1 cup heavy cream",
1 cup freshly grated Parmesan cheese",
A small handful fresh basil leaves, chopped",
Salt and pepper to taste",
Optional: red pepper flakes, optional: lemon juice