Sup Kemangi Tomat

Bahan-bahan (6 porsi)

• 1 tablespoon olive oil
• 2 tablespoons mentega
• 1 medium onion ((chopped))
• 1 clove garlic ((minced))
• 1 sejumput bumbu Italia
• 2 (28 ons cairan) kaleng tomat San Marzano utuh ((dengan jus))
• 1.5 cups kaldu ayam atau sayuran
• 1/2 cup heavy cream ((or to taste))
• 12 leaves fresh basil ((torn))
• Salt & pepper ((to taste))