Indian red lentil and potato dhal

INGREDIENTS

• 7 ounces canned chopped tomatoes
• 1 teaspoon minced garlic
• 1 tablespoon red curry paste
• 1/2 teaspoon garam masala
• 1/2 teaspoon tumeric
• 1/2 teaspoon dried chili flakes
• 1 teaspoon minced ginger
• 1 tablespoon lemon juice
• 1 red onion, finely chopped
• 14 ounces Red lentils, ready made
• 1 teaspoon indian curry powder
• 2 potatoes, medium size
• 1 teaspoon sugar
• 1 handful chopped cilantro
• 1/3 cup coconut milk