Testaroli al Pesto

INGREDIENTS

• 1/2 cup whole wheat white flour
• 1/2 cup all-purpose flour
• 1 cup water
• 1 big bunch fresh basil leaves, picked from the stems
• 1 tablespoon pine nuts
• 1 garlic clove, thinly sliced
• 1/3 cup freshly grated Pecorino or Parmesan cheese
• 1/2 cup extra-virgin olive oil, approximately, plus more for the pan
• Salt
• 1 onion, cut in half