I don't think you'll save much in terms of calories by replacing the butter with olive oil since olive oil is also high in calories (although it is at least better for you).
I would reduce the amount of olive oil used to roast the asparagus to 1/2 tbsp or less.
To cut down on the butter I would add chicken broth to the vinegar when you are cooking it. Add enough to make up for the amount of butter you are leaving out, then don't reduce the broth/vinegar all the way down to 3 tbs.
You could try leaving out the butter altogether. I've made an excellent sauce for pasta with just sauted onions, fresh diced tomatoes (with juice) (you could use canned tomatoes instead), balsamic or red wine vinegar, worcestershire sauce, basil, oregano, salt (if using fresh tomatoes), and pepper. For four servings of pasta, I would use at least 28 oz of tomatoes (they will cook down quite a bit so you might even need more--I've always made this in single serving increments so I'm having a hard time guessing the amount of tomatoes you'll need). Saute the onions (as much as you want) with one spray of olive oil. Once the onions are soft, add the tomatoes to the saute pan. Then add as much vinegar, worcestshire sauce, basil, oregano, salt and pepper as you want and simmer until sauce-like consistency. If you are generous with the vinegar and worcestorshire sauce, it has a really nice tang to it, probably similar to your current recipe (although it won't have the butter flavor). It doesn't taste like traditional tomato sauce.
- Barbara
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