Kohlrabi Curry

I was looking for something to do with the kohlrabi I had bought a couple of weeks ago.
I used this as a starting point.

3 kohlrabi bulbs, peeled and cubed
3 cloves of garlic, minced

about a tablespoon or two of vegetable oil
1 t mustard seeds
1 t cumin seeds
3 cloves of garlic, minced
1 onion, chopped
2 t curry powder
1 t salt
1/4 t powdered ginger
1 t chili powder
a can of diced tomatoes
about a tablespoon of lemon juice

Heat the oven to 400.  Cover a sheet pan with foil, spray it with olive oil spray.  Spread the kohlrabi and garlic evenly on the sheet.  Spray them with olive oil, mix them around, and roast for 15-20 minutes.

Put some oil in a pretty big skillet.  Add the mustard and cumin seeds, and heat until the seeds start to sizzle and pop.  Add the garlic, and stir around for a few seconds.  Add the onion, and cook, stirring occasionally, until it starts to soften.  Add the spices and tomatoes and roasted kohlrabi.  Continue to cook (covered if you want), stirring occasionally, and adding water as needed, until everything is done (at least 10 minutes, but more if the kohlrabi wasn't soft from roasting).