Pasta With Light Clam Sauce

• 6 1/2 cans
• 2 garlic (cloves)
• 1 basil leaves for (fresh garnish)
• 375 gr clams (chopped)
• 240 ml lite evaporated skimmed milk (undiluted)
• 160 gr tomato (chopped)
• 90 gr green onions (finely sliced)
• 75 gr dry pasta (cooked)
• 16 ml olive oil
• 5 gr cornstarch