Put the bread in a bowl and add water to cover. Let soak for 5 minutes until softened.
Meanwhile, place the almonds and garlic in a blender container (or, if using a hand-held blender, into a mixing bowl) and pulse until almonds are finely ground.
Squeeze out the water from the bread. Add to the food processor. Blend to a smooth paste.
With the motor running, add the olive oil in a slow stream, then the vinegar and salt.
Thin the ingredients with 1/2 cup of water to the desired consistency.
Place the blended contents in a tureen, wooden bowl or pitcher and add about 2 cups of water. Taste for seasoning, add more salt and/or vinegar if necessary. The soup should be fairly tangy.
Chill until serving time. Stir before serving into bowls. Garnish with grapes.
Tools You May Need
Recipe courtesy of "My Kitchen in Spain: 225 Authentic Regional Recipes" by Janet Mendel, published in 2002 by HarperCollins
Tools You May Need
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