brothy lima beans with escarole, leeks and a sherry vinegar aioli

Ingredients

• 1 lb of dried beans (i used lima)
• 3 tbsp of extra virgin olive oil
• 1 white onion, peeled + halved, the halved again
• 10 cloves of garlic, peeled
• 3 stalks of celery, roughy chopped
• 8 cups of water (approximately)
• 1 head of escarole, roughly chopped
• 1 leek, cut into 1 inch rounds
• salt
• black pepper on the big grind