_.each(data.recipe, function(recipeItem) {
    var recipeMap = that.get('recipeMap');
    recipeMap[recipeItem.id] = { id: recipeItem.id, quantity: recipeItem.quantity };
});
console.log(that.get('recipeMap')); //not ready yet.

async.each(data.recipe, function(recipeItem, callback) {
    var recipeMap = that.get('recipeMap');
    recipeMap[recipeItem.id] = { id: recipeItem.id, quantity: recipeItem.quantity };
    callback(); // show that no errors happened
}, function(err) {
    if(err) {
        console.log("There was an error" + err);
    } else {
        console.log("Loop is done");
    }
});

_.each(collection, function(model) {
    if(model.collection.indexOf(model) + 1 == collection.length) {
         // Callback goes here
    }
});