Spinach Salad With Egg Vinaigrette with tomatoes

1 large pear , chopped 2 teaspoons butter 1 tablespoon brown sugar 1 large red onion , chopped 2 teaspoons olive oil 2 teaspoons balsamic vinegar 1 tablespoon[...]

1 lb fresh spinach , cleaned,leaves removed and stems reserved 4 plum tomatoes 2 oranges , cut into sections,zested 6 mushrooms , sliced thinly 1 red onion ,[...]