Five things I could not do without in my kitchen

I like to live simply, but there are a few things that are essential for the kind of cooking we do. These are all definitely tools and not gadgets, and useful for many recipes:

1: Grinder (ground nuts, seeds and dried fruit with water = instant healthy sweets)
2: Blender (hand mashed hummus just isn't the same...)
3: Hand blender (saves messy soup transfers)
4: Peeler (the Y-shaped kind: I do peel non organic root veg because of pesticide residues, and I even use this to de-string celery!)
5: Pressure cooker (makes short work of dried beans and virtually instant vegetable stews)

What are your must-have kitchen tools?