Spaghetti Bolognese tomato sauce recipe, not watery!

[multipoodles]

I'm getting fed up of jars turning watery once added to the spaghetti at the table, we had been using Tesco own brand one for years and now water seeps out of it too. The Lidl one is the best but all the well known ones are doing the same, it's nothing to do with the spaghetti as it hasn't changed. So putting my laziness aside I think it's time to make my own, any nice recipes you use? Without the wateriness please :)

The easiest and best tomato sauce (large quantities, for freezer):

Eight tins best quality plum tomatoes
Four sticks celery, broken in three
Four small, sweet carrots, peeled and broken in three
Three onions, peeled and quartered
Eight cloves garlic, peeled

Put all ingredients in a large saucepan, bring to boil, stirring in order to mix all ingredients and to prevent burning. When it reaches the boil, turn down and simmer for 45 minutes or until carrot is soft.

Blend with a hand-held plunger blender.

When cool, divide into portions and freeze in boxes.

To use: put very good quality olive oil in a pan, add sauce and heat through. Add a small bunch of chopped basil leaves, some sea salt and some pepper a couple of minutes before serving.